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Document and Entity Information - shares	9 Months Ended
Document and Entity Information - shares	Sep. 30, 2019	Nov. 04, 2019
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q3
Document Quarterly Report	true
Document Transition Report	false
Title of 12(b) Security	Common Stock, $.01 Par Value
Trading Symbol	FORR
Security Exchange Name	NASDAQ
Entity Registrant Name	FORRESTER RESEARCH, INC.
Entity Central Index Key	0001023313
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Common Stock, Shares Outstanding		18,622,000
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Shell Company	false
Entity Incorporation, State or Country Code	DE
Entity File Number	000-21433
Entity Tax Identification Number	04-2797789
Entity Address, Address Line One	60 Acorn Park Drive
Entity Address, City or Town	CAMBRIDGE
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02140
City Area Code	617
Local Phone Number	613-6000

Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 67,629	$ 140,296
Accounts receivable, net	54,612	67,318
Deferred commissions	13,641	15,677
Prepaid expenses and other current assets	14,988	12,802
Total current assets	150,870	236,093
Property and equipment, net	27,609	22,005
Operating lease right-of-use assets	71,093
Goodwill	238,826	85,165
Intangible assets, net	102,915	4,951
Other assets	7,018	5,310
Total assets	598,331	353,524
Current Liabilities:
Accounts payable	1,093	588
Accrued expenses and other current liabilities	70,888	54,065
Current portion of long-term debt	8,594
Deferred revenue	168,008	135,332
Total current liabilities	248,583	189,985
Long-term debt, net of deferred financing fees	123,355
Non-current operating lease liabilities	63,829
Other non-current liabilities	14,912	11,939
Total liabilities	450,679	201,924
Stockholders' Equity (Note 11):
Preferred stock, $0.01 par value Authorized - 500 shares; issued and outstanding - none
Common stock, $0.01 par value Authorized - 125,000 shares Issued - 23,247 and 22,951 shares as of September 30, 2019 and December 31, 2018, respectively Outstanding - 18,616 and 18,320 shares as of September 30, 2019 and December 31, 2018, respectively	232	230
Additional paid-in capital	212,656	200,696
Retained earnings	113,257	127,717
Treasury stock - 4,631 shares as of September 30, 2019 and December 31, 2018, at cost	(171,889)	(171,889)
Accumulated other comprehensive loss	(6,604)	(5,154)
Total stockholders’ equity	147,652	151,600
Total liabilities and stockholders’ equity	$ 598,331	$ 353,524

Consolidated Balance Sheets (Parenthetical) - $ / shares	Sep. 30, 2019	Dec. 31, 2018
Statement Of Financial Position [Abstract]
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	500,000	500,000
Preferred stock, shares issued	0	0
Preferred stock, shares outstanding	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	125,000,000	125,000,000
Common stock, shares issued	23,247,000	22,951,000
Common stock, shares outstanding	18,616,000	18,320,000
Treasury stock, shares	4,631,000	4,631,000

Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenues:
Total revenues	$ 108,596	$ 84,890	$ 337,428	$ 258,992
Operating expenses:
Selling and marketing	41,605	31,051	127,655	96,771
General and administrative	13,533	11,192	39,944	32,871
Depreciation	2,121	1,965	6,310	6,056
Amortization of intangible assets	5,654	402	16,963	770
Acquisition and integration costs	2,394	977	7,848	1,306
Total operating expenses	110,236	79,948	345,330	245,311
Income (loss) from operations	(1,640)	4,942	(7,902)	13,681
Interest expense	(1,904)		(6,341)
Other income (expense), net	127	319	(229)	472
Losses on investments, net	(17)	(17)	(61)	(62)
Income (loss) before income taxes	(3,434)	5,244	(14,533)	14,091
Income tax expense (benefit)	(735)	1,294	(73)	4,086
Net income (loss)	$ (2,699)	$ 3,950	$ (14,460)	$ 10,005
Basic income (loss) per common share	$ (0.15)	$ 0.22	$ (0.78)	$ 0.55
Diluted income (loss) per common share	$ (0.15)	$ 0.21	$ (0.78)	$ 0.55
Basic weighted average common shares outstanding	18,546	18,088	18,448	18,030
Diluted weighted average common shares outstanding	18,546	18,433	18,448	18,353
Cash dividends declared per common share		$ 0.20		$ 0.60
Research Services [Member]
Revenues:
Total revenues	$ 74,548	$ 56,332	$ 219,436	$ 166,332
Advisory Services and Events [Member]
Revenues:
Total revenues	34,048	28,558	117,992	92,660
Cost of Services and Fulfillment [Member]
Operating expenses:
Cost of services and fulfillment	$ 44,929	$ 34,361	$ 146,610	$ 107,537

Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Statement Of Income And Comprehensive Income [Abstract]
Net income (loss)	$ (2,699)	$ 3,950	$ (14,460)	$ 10,005
Other comprehensive loss, net of taxes:
Foreign currency translation	(1,614)	(602)	(1,450)	(2,293)
Net change in market value of investments		65		12
Other comprehensive loss	(1,614)	(537)	(1,450)	(2,281)
Comprehensive income (loss)	$ (4,313)	$ 3,413	$ (15,910)	$ 7,724

- Definition

The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

+ References + Details

Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Cash flows from operating activities:
Net income (loss)	$ (14,460)	$ 10,005
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Depreciation	6,310	6,056
Amortization of intangible assets	16,963	770
Net losses from investments	61	62
Deferred income taxes	(9,257)	(1,305)
Stock-based compensation	8,605	6,191
Operating lease right-of-use asset amortization and impairments	9,647
Amortization of deferred financing fees	720
Amortization of discount on investments		(17)
Foreign currency losses	524	462
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	33,384	31,857
Deferred commissions	2,036	3,716
Prepaid expenses and other current assets	(610)	(68)
Accounts payable	828	19
Accrued expenses and other liabilities	(6,550)	(12,111)
Deferred revenue	6,532	(8,205)
Operating lease liabilities	(9,111)
Net cash provided by operating activities	45,622	37,432
Cash flows from investing activities:
Acquisitions, net of cash acquired	(237,684)	(9,250)
Purchases of property and equipment	(8,362)	(3,161)
Purchases of marketable investments		(31,831)
Proceeds from sales and maturities of marketable investments		33,802
Other investing activity	29
Net cash used in investing activities	(246,017)	(10,440)
Cash flows from financing activities:
Proceeds from borrowings, net of costs	171,275
Payments on borrowings	(40,688)
Payment of debt issuance costs	(857)
Deferred acquisition payments	(2,802)
Dividends paid on common stock		(10,839)
Repurchases of common stock		(9,946)
Proceeds from issuance of common stock under employee equity incentive plans	5,589	11,217
Taxes paid related to net share settlements of stock-based compensation awards	(2,232)	(2,509)
Net cash provided by (used in) financing activities	130,285	(12,077)
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(1,212)	(2,648)
Net change in cash, cash equivalents and restricted cash	(71,322)	12,267
Cash and cash equivalents, beginning of period	140,296	79,790
Cash, cash equivalents and restricted cash, end of period	68,974	92,057
Supplemental disclosure of cash flow information:
Cash paid for interest	5,466
Cash paid for income taxes	$ 3,305	$ 3,263

Consolidated Statements of Cash Flows (Parenthetical) $ in Millions	9 Months Ended
	Sep. 30, 2019 USD ($)
Statement Of Cash Flows [Abstract]
Non-cash financing activities, debt issuance costs	$ 3.7

Interim Consolidated Financial Statements

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Interim Consolidated Financial Statements

Note 1 — Interim Consolidated Financial Statements

Basis of Presentation

The accompanying unaudited interim consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and pursuant to the rules and regulations of the Securities and Exchange Commission (“SEC”) for reporting on Form 10-Q. Accordingly, certain information and footnote disclosures required for complete financial statements are not included herein. The year-end balance sheet data was derived from audited financial statements but does not include all disclosures required by accounting principles generally accepted in the United States of America. It is recommended that these financial statements be read in conjunction with the consolidated financial statements and related notes that appear in the Forrester Research, Inc. (“Forrester”) Annual Report on Form 10-K for the year ended December 31, 2018. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair statement of the financial position, results of operations, comprehensive income (loss) and cash flows as of the dates and for the periods presented have been included. The results of operations for the three and nine months ended September 30, 2019 may not be indicative of the results for the year ending December 31, 2019, or any other period.

Fair Value Measurements

The carrying amounts reflected in the Consolidated Balance Sheets for cash and cash equivalents, accounts receivable, accounts payable, and accrued expenses approximate fair value due to their short-term maturities. The Company believes that the carrying amount of its variable-rate borrowings reasonably approximate their fair values because the rates of interest on those borrowings reflect current market rates of interest. See Note 6 – Fair Value Measurements, for the fair value of the Company’s assets and liabilities.

Presentation of Restricted Cash

The following table summarizes the end-of-period cash and cash equivalents from the Company's Consolidated Balance Sheets and the total cash, cash equivalents and restricted cash as presented in the accompanying Consolidated Statements of Cash Flows (in thousands).

	Nine Months Ended September 30,
	2019		2018
Cash and cash equivalents	$	67,629	$	92,057
Restricted cash classified in (1):
Prepaid expenses and other current assets		717		—
Other assets		628		—
Cash, cash equivalents and restricted cash shown in statement of cash flows	$	68,974	$	92,057

(1)	Restricted cash consists primarily of collateral required for letters of credit. The short-term or long-term classification is determined in accordance with the expiration of the underlying lease as the letters of credit are non-cancellable while the leases are in effect.

Adoption of New Accounting Pronouncements

In February 2016, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (“ASU”) No. 2016-02, Leases (Topic 842). The standard requires lessees to recognize the assets and liabilities from leases on the balance sheet and disclose qualitative and quantitative information about the lease arrangements. Lessor accounting is largely unchanged. Leases are classified as either financing or operating, with classification affecting the pattern of expense recognition in the income statement. In July 2018, the FASB issued ASU 2018-11, Leases (Topic 842): Targeted Improvements, which allowed for an additional adoption method, and for lessors, provides a practical expedient for the separation of lease and non-lease components within a contract.

On January 1, 2019, the Company adopted Topic 842 using the modified retrospective method in which prior periods are not adjusted. Under this method, the cumulative effect of applying the standard is recorded at the date of initial application. Adoption of the standard did not result in the Company recording a cumulative effect adjustment. Adoption of the standard resulted in the recognition of operating lease right-of-use (“ROU”) assets of $53.3 million, operating lease liabilities of $60.8 million and the elimination of deferred rent of $7.5 million on the adoption date. In addition, the Company recorded $10.4 million of operating lease ROU assets and operating lease liabilities on January 3, 2019 as a result of the acquisition of SiriusDecisions (see Note 2 – Acquisitions). Adoption of the standard did not have a material impact on the Company’s results of operations or cash flows.

The Company elected the package of practical expedients permitted under Topic 842 that allows the carry forward of the historical lease classification for all leases that existed as of the adoption date. In addition, the Company elected to exempt short term leases from recognition of ROU assets and lease liabilities and elected not to separate lease and non-lease components within its leases.

The Company determines whether an arrangement is a lease at inception of the arrangement. The Company accounts for a lease when it has the right to control the leased asset for a period of time while obtaining substantially all of the assets’ economic benefits. All of the Company’s leases are operating leases, the majority of which are for office space. Operating lease ROU assets and non-current operating lease liabilities are included as individual line items on the Consolidated Balance Sheets while short-term operating lease liabilities are recorded within accrued expenses and other current liabilities.

Operating lease ROU assets and operating lease liabilities are recognized based on the present value of the future minimum lease payments over the lease term at commencement date. The discount rate used to determine the present value of the lease payments is the Company’s incremental borrowing rate based on the information available at lease inception, as generally an implicit rate in the lease is not readily determinable. An operating lease ROU asset includes all lease payments, lease incentives and initial direct costs incurred. Some of the Company’s leases include options to extend or terminate the lease. When determining the lease term, these options are included in the measurement and recognition of the Company’s ROU assets and lease liabilities when it is reasonably certain that the Company will exercise the option. The Company considers various economic factors when making this determination, including, but not limited to, the significance of leasehold improvements incurred in the office space, the difficulty in replacing the asset, underlying contractual obligations, or specific characteristics unique to a particular lease.

Subsequent to entering into a lease arrangement, the Company reassesses the certainty of exercising options to extend or terminate a lease. When it becomes reasonably certain that the Company will exercise an option, the Company accounts for the change in circumstances as a lease modification, which results in the remeasurement of the ROU asset and lease liability as of the modification date.

Lease expense for operating leases is recognized on a straight-line basis over the lease term based on the total lease payments (which include initial direct costs and lease incentives). The expense is included in operating expenses in the Consolidated Statements of Operations.

The Company’s lease agreements generally contain lease and non-lease components. Non-lease components are fixed charges stated in an agreement and primarily include payments for parking at the leased office facilities. The Company accounts for the lease and fixed payments for non-lease components as a single lease component under Topic 842, which increases the amount of the ROU assets and lease liabilities.

Most of the Company’s lease agreements also contain variable payments, primarily maintenance-related costs, which are expensed as incurred and not included in the measurement of the ROU assets and lease liabilities.

The Company incurred $0.1 million and $0.4 million of ROU asset impairments during the three and nine months ended September 30, 2019, respectively, related to facility leases from the SiriusDecisions, Inc. acquisition.

Leases with an initial term of twelve months or less are not recorded on the Consolidated Balance Sheets and are not material.

The components of lease expense were as follows (in thousands):

	Three Months Ended			Nine Months Ended
	September 30, 2019			September 30, 2019
Operating lease cost	$	3,851		$	11,215
Short-term lease cost		80			420
Variable lease cost		1,197			3,888
Sublease income		(54	)		(121	)
Total lease cost	$	5,074		$	15,402

Additional lease information is summarized in the following table (in thousands, except lease term and discount rate):

	Nine Months Ended
	September 30, 2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	9,111
Operating right-of-use assets obtained in exchange for lease obligations	$	17,770
Weighted-average remaining lease term - operating leases (years)		6.6
Weighted-average discount rate - operating leases		5.1	%

Future minimum lease payments under non-cancellable leases as of September 30, 2019 are as follows (in thousands):

2019	$	2,789
2020		15,546
2021		13,772
2022		13,321
2023		13,025
Thereafter		36,443
Total lease payments		94,896
Less imputed interest		(14,889	)
Present value of lease liabilities	$	80,007

Lease balances as of September 30, 2019 are as follows (in thousands):

Operating lease right-of-use assets	$	71,093

Short-term operating lease liabilities (1)	$	16,178
Non-current operating lease liabilities		63,829
Total operating lease liabilities	$	80,007

(1)	Included in accrued expenses and other current liabilities

The Company’s leases do not contain residual value guarantees, material restrictions or covenants, and all sublease transactions are not material.

Lease Disclosures Under Prior GAAP

Under prior GAAP, as of December 31, 2018, the Company’s future contractual obligations for operating leases were as follows (in thousands):

2019	$	12,498
2020		11,762
2021		10,145
2022		8,552
2023		7,856
Thereafter		22,222
Total minimum lease payments	$	73,035

Acquisitions

9 Months Ended

Sep. 30, 2019

Business Combinations [Abstract]

Acquisitions

Note 2 — Acquisitions

The Company accounts for business combinations in accordance with the acquisition method of accounting as prescribed by Accounting Standards Codification (“ASC”) 805, Business Combinations. The acquisition method of accounting requires the Company to record the assets and liabilities acquired based on their estimated fair values as of the acquisition date, with any excess of the consideration transferred over the estimated fair value of the net assets acquired, including identifiable intangible assets, to be recorded to goodwill.

GlimpzIt

On June 22, 2018, Forrester acquired substantially all of the assets of SocialGlimpz, Inc. (“GlimpzIt”), an artificial intelligence and machine-learning provider based in San Francisco. The acquisition is part of Forrester's plan to build a real-time customer experience or CX cloud solution, integrating a range of inputs to help companies monitor and improve customer experience. Forrester intends to deploy the GlimpzIt technology to extend the analytics engine in Forrester’s planned real-time CX cloud. The acquisition of GlimpzIt was determined to be an acquisition of a business under the provisions of ASC 805. The total purchase price was approximately $1.3 million, which was paid in cash on the acquisition date, and has been allocated as $0.7 million of goodwill and $0.6 million of an intangible asset representing technology, which is being amortized over its estimated useful life of five years. The acquired working capital was insignificant. Forrester may also be required to pay an additional $0.3 million in cash (of which $0.1 million was paid in 2019), contingent on the achievement of certain employment conditions by key employees, which is being recognized as compensation expense over the related service period of two years. Goodwill was allocated to the Product segment and is deductible for income tax purposes. Goodwill is attributable to the acquired workforce as well as future synergies.

FeedbackNow

On July 6, 2018, Forrester acquired 100% of the issued and outstanding shares of S.NOW SA, a Switzerland-based business that operates as FeedbackNow. FeedbackNow is a maker of physical buttons and monitoring software that companies deploy to measure, analyze, and improve customer experience. The acquisition is part of Forrester's plan to build a real-time CX cloud solution. FeedbackNow provides a high-volume input source for the real-time CX cloud solution. The Company paid $8.4 million on the closing date and, during the nine months ended September 30, 2019, the Company paid an additional $0.8 million for the acquired working capital. An additional $1.5 million “holdback” is payable during a two-year period from the closing date and is subject to typical indemnity provisions from the seller. The Company paid $0.5 million of this during the nine months ended September 30, 2019. In addition, the sellers may earn up to CHF 4.2 million ($4.3 million at September 30, 2019) based on the financial performance of FeedbackNow during the two-year period following the closing date, with up to $1.8 million and $2.5 million payable during 2019 and 2020, respectively, if the financial targets are met. In the third quarter of 2019, the first-year financial targets were met and as such $1.8 million was paid to the sellers during the same period. The remaining range of undiscounted amounts that could be payable under this arrangement for the second-year financial targets is zero to $2.5 million. The fair value of this contingent consideration arrangement as of the acquisition date was $3.4 million, which was recognized as purchase price. Measurement period adjustments were insignificant during 2019.

SiriusDecisions, Inc.

On January 3, 2019, Forrester acquired 100% of the issued and outstanding shares of SiriusDecisions, Inc. (“SiriusDecisions”), a privately-held company based in Wilton, Connecticut with approximately 350 employees globally. Forrester believes that the combination of its expertise in strategy with SiriusDecisions’ focus on operational excellence will create additional market opportunities for the Company, including cross-selling services to the respective client bases, extending SiriusDecisions’ platform, methodologies, data, and best-practices tools into new roles, and accelerating international and industry growth. The acquisition of SiriusDecisions was determined to be an acquisition of a business under the provisions of ASC 805.

Pursuant to the terms of the merger agreement, the Company paid $246.8 million at closing after certain transaction expense adjustments, which was subject to a working capital adjustment, and included the purchase price of $245.0 million plus an estimate of cash acquired and reduced by an estimate of certain working capital items. At the time of the merger, each vested SiriusDecisions stock option was converted into the right to receive the excess of the per share merger consideration over the exercise price of such stock option. All unvested SiriusDecisions stock options were cancelled without payment of any consideration.

Total Consideration Transferred

The following table summarizes the fair value of the aggregate consideration paid for SiriusDecisions (in thousands):

Cash paid at close (1)	$	246,801
Working capital adjustment (2)		(1,259	)
Total	$	245,542

(1)	The cash paid at close represents the gross contractual amount paid. Net cash paid, which accounts for the cash acquired of $7.9 million and the working capital adjustment of $1.3 million, was $237.7 million and is reflected as an investing activity in the Consolidated Statements of Cash Flows.

(2)	Amount represents the final amount receivable from the sellers based upon working capital as defined, which was received in the third quarter of 2019.

The following table summarizes the preliminary allocation of the purchase price to the fair value of the assets acquired and liabilities assumed for the acquisition of SiriusDecisions (in thousands):

Assets:
Cash and cash equivalents	$	7,858
Accounts receivable		19,237
Prepaids and other current assets		3,660
Fixed assets		4,169
Goodwill (1) (2)		154,906
Acquired intangible assets (3)		115,000
Other assets		265
Total assets		305,095
Liabilities:
Accounts payable and accrued liabilities		8,924
Deferred revenue		26,143
Deferred tax liability (2)		22,357
Long-term deferred revenue		1,037
Other long-term liabilities		1,092
Total liabilities		59,553
Net assets acquired	$	245,542

(1)	Goodwill represents the expected revenue and cost synergies from combining SiriusDecisions with Forrester as well as the value of the acquired workforce.

(2)	During the third quarter of 2019, the Company recorded a $1.8 million measurement period adjustment related to deferred taxes. The adjustment reduced the allocation of the purchase price to both deferred tax liabilities and goodwill.

(3)

All of the acquired intangible assets are finite-lived. The determination of the fair value of the finite-lived intangible assets required management judgment and the consideration of a number of factors. In determining the fair values, management primarily relied on income valuation methodologies, in particular discounted cash flow models. The discounted cash flow models required the use of estimates, including projected cash flows related to the particular asset, the useful lives of the particular assets, the selection of royalty and discount rates used in the models and certain published industry benchmark data. In establishing the estimated useful lives of the acquired intangible assets, the Company relied primarily on the duration of the cash flows utilized in the valuation model. Of the $115.0 million assigned to acquired intangible assets, $13.0 million was assigned to the technology asset class with useful lives of 1 to 8 years (with a weighted average amortization period of 3.2 years), $13.0 million to backlog with a useful life of 2.0 years, $77.0 million to customer relationships with a useful life of 9.25 years, and $12.0 million to trade names with a useful life of 15.5 years. The weighted-average amortization period for the total acquired intangible assets is 8.4 years. Amortization of acquired intangible assets was $5.4 million and $16.3 million for the three and nine months ended September 30, 2019, respectively.

The allocation of the purchase price for SiriusDecisions is preliminary with respect to the valuation of acquired intangible assets, deferred taxes, and goodwill. The Company expects to obtain the remainder of the information to complete the allocation of purchase price by the end of 2019.

The Company’s financial statements include the operating results of SiriusDecisions beginning on January 3, 2019, the date of the acquisition. SiriusDecision’s operating results and the related goodwill are being reported as its own operating segment (refer to Note 12 – Operating Segments). The goodwill is not deductible for income tax purposes. The acquisition of SiriusDecisions added approximately $16.8 million and $59.5 million of additional revenue and $22.2 million and $79.2 million of direct expenses, including intangible amortization, for the three and nine months ended September 30, 2019, respectively. Had the Company acquired SiriusDecisions in prior periods, the Company’s operating results would have been materially different, and as a result the following unaudited pro forma financial information is presented as if SiriusDecisions had been acquired by the Company on January 1, 2018 (in thousands):

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2019			2018			2019			2018
Pro forma total revenue	$	110,224		$	101,848		$	347,751		$	318,094
Pro forma net loss	$	(1,092	)	$	(2,511	)	$	(5,359	)	$	(9,951	)

The pro forma results have been prepared in accordance with U.S. GAAP and include the following pro forma adjustments for the three and nine months ended September 30, 2018: (1) an increase in interest expense and amortization of debt issuance costs related to the financing of the SiriusDecisions acquisition (refer to Note 4 – Debt for further information on the Company’s borrowings related to the acquisition); (2) a decrease in revenue as a result of the fair value adjustment to deferred revenue; and (3) an adjustment for depreciation and amortization expenses as a result of the preliminary purchase price allocation for finite-lived intangible assets and property and equipment. In addition, the nine months ended September 30, 2018 has been adjusted to increase operating costs to recognize acquisition costs incurred upon the close of the acquisition. The three and nine months ended September 30, 2019 have been adjusted to add the year two amounts, and eliminate the year one amounts, for the fair value of deferred revenue, depreciation and amortization expense and interest expense. In addition, the nine months ended September 30, 2019 have been adjusted to eliminate the acquisition costs incurred upon the close of the acquisition.

The Company recognized $1.7 million of acquisition costs for the three months ended March 31, 2019 and the nine months ended September 30, 2019 related to the SiriusDecisions acquisition. The costs primarily consisted of investment banker fees and other professional services costs and are included in acquisition and integration costs within the Consolidated Statements of Operations.

Goodwill and Intangible Assets

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Goodwill and Intangible Assets

Note 3 — Goodwill and Intangible Assets

Goodwill

The change in the carrying amount of goodwill for the nine months ended September 30, 2019 is summarized as follows (in thousands):

	Total
Balance at December 31, 2018	$	85,165
Acquisition		154,906
Translation adjustments		(1,245	)
Balance at September 30, 2019	$	238,826

As of September 30, 2019, the Company had no accumulated goodwill impairment losses.

Finite-Lived Intangible Assets

During the nine months ended September 30, 2019, $115.0 million of intangible assets were added as a result of the acquisition of SiriusDecisions.

The carrying values of finite-lived intangible assets are as follows (in thousands):

	September 30, 2019
	Gross				Net
	Carrying		Accumulated		Carrying
	Amount		Amortization		Amount
Amortizable intangible assets:
Customer relationships	$	109,551	$	37,784	$	71,767
Technology		16,577		5,347		11,230
Backlog		13,000		4,875		8,125
Trade name		12,438		645		11,793
Total	$	151,566	$	48,651	$	102,915

	December 31, 2018
	Gross				Net
	Carrying		Accumulated		Carrying
	Amount		Amortization		Amount
Amortizable intangible assets:
Customer relationships	$	32,823	$	31,604	$	1,219
Technology		3,610		295		3,315
Trade name		443		26		417
Total	$	36,876	$	31,925	$	4,951

Estimated intangible asset amortization expense as of September 30, 2019 is as follows (in thousands):

Year ending December 31, 2019 (remainder)	$	5,653
Year ending December 31, 2020		18,822
Year ending December 31, 2021		12,322
Year ending December 31, 2022		10,984
Year ending December 31, 2023		10,812
Thereafter		44,322
Total	$	102,915

Debt

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Debt

Note 4 — Debt

In connection with the acquisition of SiriusDecisions, the Company entered into a $200.0 million Credit Agreement on January 3, 2019 (the “Closing Date”). The Credit Agreement provides for: (1) senior secured term loans in an aggregate principal amount of $125.0 million (the “Term Loans”) and (2) a senior secured revolving credit facility in an aggregate principal amount of $75.0 million (the “Revolving Credit Facility” and, together with the Term Loans, the “Facilities”). On the Closing Date, the full $125.0 million of the Term Loans and $50.0 million of the Revolving Credit Facility were used to finance a portion of the acquisition of SiriusDecisions and to pay certain fees, costs and expenses incurred in connection with the acquisition and the Facilities. The Facilities are scheduled to mature on January 3, 2024.

The Facilities permit the Company to borrow incremental term loans and/or increase commitments under the Revolving Credit Facility in an aggregate principal amount up to $50.0 million, subject to approval by the administrative agent and certain customary terms and conditions.

The Facilities can be repaid early, in part or in whole, at any time and from time to time, without premium or penalty, other than customary breakage reimbursement requirements for London Interbank Offering Rate (“LIBOR”) based loans. The Term Loans must be prepaid with net cash proceeds of (i) certain debt incurred or issued by Forrester and its restricted subsidiaries and (ii) certain asset sales and condemnation or casualty events, subject to certain reinvestment rights.

Amounts borrowed under the Facilities bear interest, at Forrester’s option, at a rate per annum equal to either (i) LIBOR for the applicable interest period plus a margin that is between 1.75% and 2.50% based on Forrester’s consolidated total leverage ratio or (ii) the alternate base rate plus a margin that is between 0.75% and 1.50% based on Forrester’s consolidated total leverage ratio. In addition, the Company will pay a commitment fee that is between 0.25% and 0.35% per annum, based on Forrester’s consolidated total leverage ratio, on the average daily unused portion of the Revolving Credit Facility, payable quarterly, in arrears.

The Term Loans require repayment of the outstanding principal balance in quarterly installments each year, commencing on March 31, 2019 with the balance repayable on the maturity date, subject to customary exceptions. The amount payable in each year as of September 30, 2019 is set forth in the table below (in thousands):

2019 (remainder)	$	1,563
2020		9,375
2021		12,500
2022		12,500
2023		15,625
Thereafter		68,750
Total remaining principal payments	$	120,313

The Revolving Credit Facility does not require repayment prior to maturity, subject to customary exceptions. In addition to financing the acquisition, proceeds from the Revolving Credit Facility can also be used towards working capital and general corporate purposes. Up to $5.0 million of the Revolving Credit Facility is available for the issuance of letters of credit, and any drawings under the letters of credit must be reimbursed within one business day.

Forrester incurred $1.8 million in costs related to the Revolving Credit Facility, which are recorded in other assets on the Consolidated Balance Sheets. These costs are being amortized as interest expense on a straight-line basis over the five-year term of the Revolving Credit Facility. Forrester incurred $2.8 million in costs related to the Term Loans, which are recorded as a reduction to the face value of long-term debt on the Consolidated Balance Sheets. These costs are being amortized as interest expense utilizing the effective interest rate method.

Outstanding Borrowings

The following table summarizes the Company’s total outstanding borrowings as of the dates indicated (in thousands):

Description:	September 30, 2019			December 31, 2018
Term loan facility (1)	$	120,313		$	—
Revolving credit facility (1) (2)		14,000			—
Principal amount outstanding (3)		134,313			—
Less: Deferred financing fees		(2,364	)		—
Net carrying amount	$	131,949		$	—

(1)

The contractual annualized interest rate as of September 30, 2019 on the Term loan facility was 4.375%, which consisted of LIBOR of 2.125% plus a margin of 2.25%, and the annualized interest rate on the Revolving Credit Facility was 4.3125%, which consisted of LIBOR of 2.0625% plus a margin of 2.25%.

(2)	The Company had $61.0 million of available borrowing capacity on the revolver (not including the expansion feature) as of September 30, 2019.

(3)	The weighted average annual effective rates on the Company's total debt outstanding for the three and nine months ended September 30, 2019, were 4.53% and 4.88%, respectively.

The Facilities contain certain customary restrictive loan covenants, including among others, financial covenants that apply a maximum leverage ratio and minimum fixed charge coverage ratio. The negative covenants limit, subject to various exceptions, the Company’s ability to incur additional indebtedness, create liens on assets, merge, consolidate, liquidate or dissolve any part of the Company, sell assets, pay dividends or other payments in respect to capital stock, change fiscal year, or enter into certain transactions with affiliates and subsidiaries. The Company was in full compliance with the covenants as of September 30, 2019. The Facilities also contain customary events of default, representations, and warranties.

All obligations under the Facilities are unconditionally guaranteed by each of the Company’s existing and future, direct and indirect material wholly-owned domestic subsidiaries, other than certain excluded subsidiaries, and are collateralized by a first priority lien on substantially all tangible and intangible assets including intellectual property and all of the capital stock of the Company and its subsidiaries (limited to 65% of the voting equity of certain subsidiaries).

Accumulated Other Comprehensive Loss

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Accumulated Other Comprehensive Loss

Note 5 — Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows (in thousands):

				Total
	Cumulative			Accumulated
	Translation			Other Comprehensive
	Adjustment			Loss
Balance at January 1, 2019	$	(5,154	)	$	(5,154	)
Foreign currency translation		(1,450	)		(1,450	)
Balance at September 30, 2019	$	(6,604	)	$	(6,604	)

							Total
	Net Unrealized			Cumulative			Accumulated
	Loss on Marketable			Translation			Other Comprehensive
	Investments			Adjustment			Loss
Balance at January 1, 2018	$	(115	)	$	(1,897	)	$	(2,012	)
Reclassification of stranded tax effects from tax reform		(26	)		—			(26	)
Foreign currency translation		—			(2,293	)		(2,293	)
Unrealized gain on investments, net of tax of $4		12			—			12
Balance at September 30, 2018	$	(129	)	$	(4,190	)	$	(4,319	)

				Total
	Cumulative			Accumulated
	Translation			Other Comprehensive
	Adjustment			Loss
Balance at July 1, 2019	$	(4,990	)	$	(4,990	)
Foreign currency translation		(1,614	)		(1,614	)
Balance at September 30, 2019	$	(6,604	)	$	(6,604	)

							Total
	Net Unrealized			Cumulative			Accumulated
	Loss on Marketable			Translation			Other Comprehensive
	Investments			Adjustment			Loss
Balance at July 1, 2018	$	(194	)	$	(3,588	)	$	(3,782	)
Foreign currency translation		—			(602	)		(602	)
Unrealized gain on investments, net of tax of $21		65			—			65
Balance at September 30, 2018	$	(129	)	$	(4,190	)	$	(4,319	)

Fair Value Measurements

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Fair Value Measurements

Note 6 — Fair Value Measurements

The Company measures certain financial assets at fair value on a recurring basis, including cash equivalents, available-for-sale securities and any contingent purchase price related to acquisitions. The fair values of these financial assets have been classified as Level 1, 2 or 3 within the fair value hierarchy as described in the accounting standards for fair value measurements.

Level 1 — Fair value based on quoted prices in active markets for identical assets or liabilities.

Level 2 — Fair value based on inputs other than Level 1 inputs that are observable, either directly or indirectly, such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

Level 3 — Fair value based on unobservable inputs that are supported by little or no market activity and such inputs are significant to the fair value of the assets or liabilities.

During the nine months ended September 30, 2019 and 2018, the Company did not transfer assets or liabilities between levels of the fair value hierarchy. The following table represents the Company’s fair value hierarchy for its financial assets and liabilities that are measured at fair value on a recurring basis (in thousands):

	As of September 30, 2019
	Level 1		Level 2		Level 3			Total
Assets:
Money market funds (1)	$	5,367	$	—	$	—		$	5,367
Total Assets:	$	5,367	$	—	$	—		$	5,367

Liabilities
Contingent purchase price (2)	$	—	$	—	$	(2,443	)	$	(2,443	)
Total Liabilities:	$	—	$	—	$	(2,443	)	$	(2,443	)

	As of December 31, 2018
	Level 1		Level 2		Level 3			Total
Assets:
Money market funds (1)	$	255	$	—	$	—		$	255
Total Assets:	$	255	$	—	$	—		$	255

Liabilities
Contingent purchase price (2)	$	—	$	—	$	(4,196	)	$	(4,196	)
Total Liabilities:	$	—	$	—	$	(4,196	)	$	(4,196	)

(1)	Included in cash and cash equivalents.

(2)	$2.4 million and $1.8 million is included in accrued expenses and other current liabilities as of September 30, 2019 and December 31, 2018, respectively. $2.4 million is included in non-current liabilities as of December 31, 2018.

Level 3 liabilities at September 30, 2019 consist entirely of the contingent purchase price related to the acquisition of FeedbackNow. Changes in the fair value of Level 3 contingent consideration for the nine months ended September 30, 2019 were as follows (in thousands):

	Contingent
	Consideration
Balance at December 31, 2018	$	(4,196	)
Fair value adjustment of contingent purchase price (1)		(57	)
Payment of contingent purchase price		1,769
Foreign exchange effect		41
Balance at September 30, 2019	$	(2,443	)

(1)

This amount was recognized as acquisition and integration costs within the Consolidated Statements of Operations. As of September 30, 2019, the significant unobservable inputs used in the Monte Carlo simulation to fair value the contingent consideration included projected contract bookings, a discount rate of 17.3%, and revenue volatility of 26.6%. Increases or decreases in the inputs would result in a higher or lower fair value measurement.

- Definition

The entire disclosure for the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments as well as disclosures related to the fair value of non-financial assets and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the entity is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risks are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

+ References + Details

Non-Marketable Investments

9 Months Ended

Sep. 30, 2019

Investments Debt And Equity Securities [Abstract]

Non-Marketable Investments

Note 7 — Non-Marketable Investments

At September 30, 2019 and December 31, 2018, the carrying value of the Company’s non-marketable investments, which were composed of interests in technology-related private equity funds, was $2.4 million and $2.5 million, respectively, and is included in other assets in the Consolidated Balance Sheets.

The Company’s non-marketable investments at September 30, 2019 are being accounted for using the equity method as the investments are limited partnerships and the Company has an ownership interest in excess of 5% and, accordingly, the Company records its share of the investee’s operating results each period. Losses from non-marketable investments were immaterial during the three months ended September 30, 2019 and 2018. Losses from non-marketable investments were $0.1 million during the nine months ended September 30, 2019 and 2018. Losses are included in losses on investments, net in the Consolidated Statements of Operations. During the three and nine months ended September 30, 2019 and 2018, no distributions were received from the funds.

Contract Assets and Liabilities

9 Months Ended

Sep. 30, 2019

Revenue From Contract With Customer [Abstract]

Contract Assets and Liabilities

Note 8 – Contract Assets and Liabilities

Accounts Receivable

Accounts receivable includes amounts billed and currently due from customers. Since the only condition for payment of our invoices is the passage of time, the Company records a receivable on the date the invoice is issued. Also included in accounts receivable are unbilled amounts resulting from revenue exceeding the amount billed to the customer, where the right to payment is unconditional. If the right to payment for services performed was conditional on something other than the passage of time, the unbilled amount would be recorded as a separate contract asset. There were no contract assets as of September 30, 2019 or 2018.

The majority of the Company’s contracts are non-cancellable. However, for contracts that are cancellable by the customer, the Company does not record a receivable when it issues an invoice. The Company records accounts receivable on these contracts only up to the amount of revenue earned but not yet collected.

In addition, since the majority of the Company’s contracts are for a duration of one year and payment is expected within one year from the transfer of products and services, the Company does not adjust its receivables or transaction price for the effects of a significant financing component.

Deferred Revenue

The Company refers to contract liabilities as deferred revenue on the Consolidated Balance Sheets. Payment terms in the Company’s customer contracts vary, but generally require payment in advance of fully satisfying the performance obligation(s). Deferred revenue consists of billings in excess of revenue recognized. Similar to accounts receivable, the Company does not record deferred revenue for invoices issued on a cancellable contract.

During the three and nine months ended September 30, 2019, the Company recognized approximately $21.2 million and $132.8 million of revenue related to its deferred revenue balance at January 1, 2019. During the three and nine months ended September 30, 2018, the Company recognized approximately $24.7 million and $128.6 million, respectively, of revenue related to its deferred revenue balance at January 1, 2018. To determine revenue recognized in the current period from deferred revenue at the beginning of the period, the Company first allocates revenue to the individual deferred revenue balance outstanding at the beginning of the period, until the revenue equals that balance.

Approximately $307.6 million of revenue is expected to be recognized during the next 12 to 24 months from remaining performance obligations as of September 30, 2019.

Cost to Obtain Contracts

The Company capitalizes commissions paid to internal sales representatives and related fringe benefits costs that are incremental to obtaining customer contracts. These costs are included in deferred commissions on the Consolidated Balance Sheets. The Company accounts for these costs at a portfolio level as the Company’s contracts are similar in nature and the amortization model used closely matches the amortization expense that would be recognized on a contract-by-contract basis. Costs to obtain a contract are amortized to operations as the related revenue is recognized over the initial contract term. Amortization expense related to deferred commissions was $8.1 million and $24.1 million for the three and nine months ended September 30, 2019, respectively. Amortization expense related to deferred commissions was $7.2 million and $22.4 million for the three and nine months ended September 30, 2018, respectively. The Company evaluates the recoverability of deferred commissions at each balance sheet date.

Income Taxes

9 Months Ended

Sep. 30, 2019

Income Tax Disclosure [Abstract]

Income Taxes

Note 9 — Income Taxes

Forrester provides for income taxes on an interim basis according to management’s estimate of the effective tax rate expected to be applicable for the full fiscal year. Certain items such as changes in tax rates, tax benefits or expense related to settlements of share-based payment awards, and foreign currency gains or losses are treated as discrete items and are recorded in the period in which they arise.

Income tax benefit for the nine months ended September 30, 2019 was $0.1 million resulting in an effective tax rate of 0.5% for the period. The Company recorded a net $0.2 million discrete tax expense during the nine months ended September 30, 2019 due to the settlement of a U.S. Competent Authority claim during the period which was partially offset by the tax benefits from stock-based compensation settlements. Income tax expense for the nine months ended September 30, 2018 was $4.1 million resulting in an effective tax rate of 29.0% for the period.

The Company anticipates that its effective tax rate for the full year 2019 will be approximately 0% to 5% due to a projected pretax loss for the year and a minimal amount of tax expense for the year due to non-deductible expense items and tax expense related to the Competent Authority claim.

In July 2015, the U.S. Tax Court issued an opinion in Altera Corp. v. Commissioner related to the treatment of stock-based compensation expense in an intercompany cost-sharing arrangement. The opinion invalidated part of a treasury regulation requiring stock-based compensation to be included in any qualified intercompany cost-sharing arrangement. The Company previously recorded a tax benefit based on the opinion in the case. In June 2019, the U.S. Court of Appeals for Ninth Circuit reversed the U.S. Tax Court’s decision. Currently, Altera Corp. submitted its appeal for an en banc rehearing before the U.S. Court of Appeals for the Ninth Circuit. Due to the uncertainty surrounding the status of the current regulations and questions related to jurisdiction, the Company has determined no adjustment is required to the consolidated financial statements as a result of this ruling. The Company will continue to monitor ongoing developments and potential impacts to its consolidated financial statements.

Net Income (Loss) Per Common Share

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Net Income (Loss) Per Common Share

Note 10 — Net Income (Loss) Per Common Share

Basic net income (loss) per common share is computed by dividing net income (loss) by the basic weighted average number of common shares outstanding during the period. Diluted net income (loss) per common share is computed by dividing net income (loss) by the diluted weighted average number of common shares and common equivalent shares outstanding during the period. The weighted average number of common equivalent shares outstanding has been determined in accordance with the treasury-stock method. Common equivalent shares consist of common stock issuable on the exercise of outstanding stock options and the vesting of restricted stock units.

Basic and diluted weighted average common shares are as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Basic weighted average common shares outstanding		18,546		18,088		18,448		18,030
Weighted average common equivalent shares		—		345		—		323
Diluted weighted average common shares outstanding		18,546		18,433		18,448		18,353
Options and restricted stock units excluded from diluted weighted average share calculation as effect would have been anti-dilutive		1,090		1		1,086		10

Stockholders' Equity

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Stockholders' Equity

Note 11 — Stockholders’ Equity

The components of stockholders’ equity are as follows (in thousands):

	Three Months Ended September 30, 2019
	Common Stock										Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital			Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at July 1, 2019		23,089	$	231	$	210,378		$	115,956			4,631	$	(171,889	)	$	(4,990	)	$	149,686
Issuance of common stock under stock plans, net		158		1		(794	)		—			—		—			—			(793	)
Stock-based compensation expense		—		—		3,072			—			—		—			—			3,072
Net loss		—		—		—			(2,699	)		—		—			—			(2,699	)
Foreign currency translation		—		—		—			—			—		—			(1,614	)		(1,614	)
Balance at September 30, 2019		23,247	$	232	$	212,656		$	113,257			4,631	$	(171,889	)	$	(6,604	)	$	147,652

	Three Months Ended September 30, 2018
	Common Stock									Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital		Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at July 1, 2018		22,564	$	226	$	189,554	$	125,698			4,624	$	(171,585	)	$	(3,782	)	$	140,111
Issuance of common stock under stock plans, net		329		3		5,129		—			—		—			—			5,132
Stock-based compensation expense		—		—		2,120		—			—		—			—			2,120
Repurchases of common stock		—		—		—		—			7		(304	)		—			(304	)
Dividends paid on common shares		—		—		—		(3,642	)		—		—			—			(3,642	)
Net income		—		—		—		3,950			—		—			—			3,950
Net change in marketable investments, net of tax		—		—		—		—			—		—			65			65
Foreign currency translation		—		—		—		—			—		—			(602	)		(602	)
Balance at September 30, 2018		22,893	$	229	$	196,803	$	126,006			4,631	$	(171,889	)	$	(4,319	)	$	146,830

	Nine Months Ended September 30, 2019
	Common Stock									Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital		Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at January 1, 2019		22,951	$	230	$	200,696	$	127,717			4,631	$	(171,889	)	$	(5,154	)	$	151,600
Issuance of common stock under stock plans, net		296		2		3,355		—			—		—			—			3,357
Stock-based compensation expense		—		—		8,605		—			—		—			—			8,605
Net loss		—		—		—		(14,460	)		—		—			—			(14,460	)
Foreign currency translation		—		—		—		—			—		—			(1,450	)		(1,450	)
Balance at September 30, 2019		23,247	$	232	$	212,656	$	113,257			4,631	$	(171,889	)	$	(6,604	)	$	147,652

	Nine Months Ended September 30, 2018
	Common Stock									Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital		Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at January 1, 2018		22,432	$	224	$	181,910	$	123,010			4,391	$	(161,943	)	$	(2,012	)	$	141,189
Issuance of common stock under stock plans, net		461		5		8,703		—			—		—			—			8,708
Cumulative effect adjustment due to adoption of new accounting pronouncements		—		—		—		3,830			—		—			(26	)		3,804
Stock-based compensation expense		—		—		6,190		—			—		—			—			6,190
Repurchases of common stock		—		—		—		—			240		(9,946	)		—			(9,946	)
Dividends paid on common shares		—		—		—		(10,839	)		—		—			—			(10,839	)
Net income		—		—		—		10,005			—		—			—			10,005
Net change in marketable investments, net of tax		—		—		—		—			—		—			12			12
Foreign currency translation		—		—		—		—			—		—			(2,293	)		(2,293	)
Balance at September 30, 2018		22,893	$	229	$	196,803	$	126,006			4,631	$	(171,889	)	$	(4,319	)	$	146,830

Equity Plans

Restricted stock unit activity for the nine months ended September 30, 2019 is presented below (in thousands, except per share data):

				Weighted-
				Average
	Number of			Grant Date
	Shares			Fair Value
Unvested at December 31, 2018		497		$	40.89
Granted		434			43.87
Vested		(186	)		39.40
Forfeited		(56	)		43.39
Unvested at September 30, 2019		689		$	42.96

Stock option activity for the nine months ended September 30, 2019 is presented below (in thousands, except per share data and contractual term):

				Weighted -		Weighted -
				Average		Average
				Exercise		Remaining		Aggregate
	Number			Price Per		Contractual		Intrinsic
	of Shares			Share		Term (in years)		Value
Outstanding at December 31, 2018		583		$	35.27
Granted		—			—
Exercised		(105	)		34.07
Forfeited		(20	)		35.38
Outstanding at September 30, 2019		458		$	35.54		4.32	$	33,163
Exercisable at September 30, 2019		443		$	35.55		4.24	$	31,430
Vested and expected to vest at September 30, 2019		458		$	35.54		4.32	$	33,163

Stock-Based Compensation

Forrester recognizes the fair value of stock-based compensation in net income (loss) over the requisite service period of the individual grantee, which generally equals the vesting period. Stock-based compensation was recorded in the following expense categories (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Cost of services and fulfillment	$	1,782	$	1,001	$	4,812	$	3,128
Selling and marketing		441		261		1,366		752
General and administrative		849		858		2,427		2,311
Total	$	3,072	$	2,120	$	8,605	$	6,191

Forrester utilizes the Black-Scholes valuation model for estimating the fair value of shares subject to purchase under the employee stock purchase plan, which were valued using the following assumptions:

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2019			2018			2019			2018
Average risk-free interest rate		1.89	%		2.34	%		1.89	%		1.80	%
Expected dividend yield		0.0	%		1.6	%		0.0	%		1.9	%
Expected life	0.5 Years			0.5 Years			0.5 Years			0.5 Years
Expected volatility		30	%		25	%		30	%		22	%
Weighted average fair value	$	8.29		$	10.87		$	8.29		$	8.72

Dividends

As a result of the acquisition of SiriusDecisions on January 3, 2019 and the related debt incurred to fund the acquisition, the Company suspended its dividend program beginning in 2019. Accordingly, the Company did not declare or pay any dividends in the three and nine months ended September 30, 2019. In the nine months ended September 30, 2018, the Company declared and paid three quarterly dividends of $0.20 per share or $10.8 million in the aggregate.

Treasury Stock

As of September 30, 2019, Forrester’s Board of Directors had authorized an aggregate $535.0 million to purchase common stock under its stock repurchase program. The shares repurchased may be used, among other things, in connection with Forrester’s equity incentive and purchase plans. In the nine months ended September 30, 2019, the Company did not repurchase any shares of common stock. In the three months ended September 30, 2018, the Company repurchased an insignificant number of shares at an aggregate cost of approximately $0.3 million. In the nine months ended September 30, 2018, the Company repurchased approximately 0.2 million shares of common stock at an aggregate cost of approximately $10.0 million. From the inception of the program through September 30, 2019, the Company repurchased 16.3 million shares of common stock at an aggregate cost of $474.9 million.

Operating Segments

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Operating Segments

Note 12 — Operating Segments

In conjunction with the acquisition of SiriusDecisions in the first quarter of 2019, the Company realigned its management structure into Products, Research and SiriusDecisions.

The Products segment includes the revenues of the Connect, Analytics, and Events products (excluding the revenues from SiriusDecisions products) and the costs of the organizations responsible for developing and delivering these products. In addition, this segment includes Consulting revenues and the related cost of the Company’s project consulting organization. The project consulting organization delivers a majority of the Company’s project consulting revenue (excluding SiriusDecisions consulting) and certain advisory services primarily related to the Analytics product line. This segment also includes the costs of the product management organization that is responsible for product pricing and packaging and the launch of new products.

The Research segment includes the revenues of the Research products and the cost of the organizations responsible for developing and delivering the Research products (excluding the costs and revenues from SiriusDecisions products). In addition, this segment includes Consulting revenues primarily from the delivery of advisory services (such as workshops, speeches and advisory days) delivered by the Company’s research analysts.

The SiriusDecisions segment includes the revenues of the legacy SiriusDecisions products and the costs of the organizations responsible for developing and delivering these products. In addition, this segment includes the costs of marketing, technology development and business support departments of the legacy SiriusDecisions business.

The Company evaluates reportable segment performance and allocates resources based on segment revenues and expenses. Segment expenses include the direct expenses of each segment organization and exclude, except as noted above for the SiriusDecisions segment, selling and marketing expenses, general and administrative expenses, stock-based compensation expense, depreciation expense, adjustments to incentive bonus compensation from target amounts, amortization of intangible assets, interest and other expense, and losses on investments. The accounting policies used by the segments are the same as those used in the consolidated financial statements.

The Company is providing disaggregated revenue by product in the segment tables below (in thousands). The 2018 amounts have been reclassified to conform to the current presentation.

	Products		Research		Sirius Decisions		Consolidated
Three Months Ended September 30, 2019
Research services revenues
Research	$	—	$	40,315	$	14,708	$	55,023
Connect		13,819		—		437		14,256
Analytics		5,269		—		—		5,269
Total research services revenues		19,088		40,315		15,145		74,548

Advisory services and events revenues
Consulting		19,298		11,902		1,419		32,619
Events		1,201		—		228		1,429
Total advisory services and events revenues		20,499		11,902		1,647		34,048
Total segment revenues		39,587		52,217		16,792		108,596
Segment expenses		18,374		13,525		8,672		40,571
Contribution margin		21,213		38,692		8,120		68,025
Selling, marketing, administrative and other expenses								(61,617	)
Amortization of intangible assets								(5,654	)
Acquisition and integration costs								(2,394	)
Interest expense, other income and loss on investments								(1,794	)
Loss before income taxes							$	(3,434	)

	Products		Research		Sirius Decisions		Consolidated
Three Months Ended September 30, 2018
Research services revenues
Research	$	—	$	38,199	$	—	$	38,199
Connect		12,890		—		—		12,890
Analytics		5,243		—		—		5,243
Total research services revenues		18,133		38,199		—		56,332

Advisory services and events revenues
Consulting		15,888		11,755		—		27,643
Events		915		—		—		915
Total advisory services and events revenues		16,803		11,755		—		28,558
Total segment revenues		34,936		49,954		—		84,890
Segment expenses		17,800		13,109		—		30,909
Contribution margin		17,136		36,845		—		53,981
Selling, marketing, administrative and other expenses								(47,660	)
Amortization of intangible assets								(402	)
Acquisition and integration costs								(977	)
Other income and loss on investments								302
Income before income taxes							$	5,244

					Sirius
	Product		Research		Decisions		Consolidated
Nine Months Ended September 30, 2019
Research services revenues
Research	$	—	$	118,258	$	42,850	$	161,108
Connect		40,459		—		1,435		41,894
Analytics		16,434		—		—		16,434
Total research services revenues		56,893		118,258		44,285		219,436

Advisory services and events revenues
Consulting		56,156		38,173		4,094		98,423
Events		8,422		—		11,147		19,569
Total advisory services and events revenues		64,578		38,173		15,241		117,992
Total segment revenues		121,471		156,431		59,526		337,428
Segment expenses		59,982		41,301		33,580		134,863
Contribution margin		61,489		115,130		25,946		202,565
Selling, marketing, administrative and other expenses								(185,656	)
Amortization of intangible assets								(16,963	)
Acquisition and integration costs								(7,848	)
Interest expense, other expense and losses on investments								(6,631	)
Loss before income taxes							$	(14,533	)

					Sirius
	Products		Research		Decisions		Consolidated
Nine Months Ended September 30, 2018
Research services revenues
Research	$	—	$	113,897	$	—	$	113,897
Connect		37,992		—		—		37,992
Analytics		14,443		—		—		14,443
Total research services revenues		52,435		113,897		—		166,332

Advisory services and events revenues
Consulting		46,658		37,078		—		83,736
Events		8,924		—		—		8,924
Total advisory services and events revenues		55,582		37,078		—		92,660
Total segment revenues		108,017		150,975		—		258,992
Segment expenses		54,841		39,898		—		94,739
Contribution margin		53,176		111,077		—		164,253
Selling, marketing, administrative and other expenses								(148,496	)
Amortization of intangible assets								(770	)
Acquisition and integration costs								(1,306	)
Other income and losses on investments								410
Income before income taxes							$	14,091

Recent Accounting Pronouncements

9 Months Ended

Sep. 30, 2019

New Accounting Pronouncements And Changes In Accounting Principles [Abstract]

Recent Accounting Pronouncements

Note 13 — Recent Accounting Pronouncements

In June 2016, the FASB issued ASU No. 2016-13, Financial Instruments - Credit Losses: Measurement of Credit Losses on Financial Instruments. The new standard amends the current financial instrument impairment model by requiring entities to use a forward-looking approach based on expected losses to estimate credit losses on certain types of financial instruments, including trade receivables. The new standard will be effective for the Company on January 1, 2020. The adoption of this standard is not expected to have a material impact on the Company’s financial position or results of operations.

In January 2017, the FASB issued ASU No. 2017-04, Intangibles-Goodwill and Other: Simplifying the Test for Goodwill Impairment. The new standard simplifies the subsequent measurement of goodwill by eliminating Step 2 from the goodwill impairment test and requires that instead, an entity should perform its goodwill impairment test by comparing the fair value of a reporting unit with its carrying amount. The new standard will be effective for the Company on January 1, 2020. The adoption of this standard is not expected to have a material impact on the Company’s financial position or results of operations.

In August 2018, the FASB issued ASU No. 2018-13, Fair Value Measurement Disclosure Framework – Changes to the Disclosure Requirements for Fair Value Measurement. The new standard modifies the disclosure requirements on fair value measurements in Topic 820, Fair Value Measurement. The standard includes changes to fair value transfers and Level 3 fair value disclosures. The new standard will be effective for the Company on January 1, 2020. The adoption of this standard is not expected to have a material impact on the Company’s financial position or results of operations.

In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software: Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That is a Service Contract. The new standard aligns the requirements for capitalizing implementation costs incurred in a hosting arrangement that is a service contract with the requirements for capitalizing implementation costs incurred to develop or obtain internal-use software (and hosting arrangements that include an internal-use software license). The new standard will be effective for the Company on January 1, 2020. The Company is currently evaluating the potential impact that this standard may have on its financial position and results of operations.

Interim Consolidated Financial Statements (Policies)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Basis of Presentation

Fair Value Measurements

Presentation of Restricted Cash

	Nine Months Ended September 30,
	2019		2018
Cash and cash equivalents	$	67,629	$	92,057
Restricted cash classified in (1):
Prepaid expenses and other current assets		717		—
Other assets		628		—
Cash, cash equivalents and restricted cash shown in statement of cash flows	$	68,974	$	92,057

(1)	Restricted cash consists primarily of collateral required for letters of credit. The short-term or long-term classification is determined in accordance with the expiration of the underlying lease as the letters of credit are non-cancellable while the leases are in effect.

Adoption of New Accounting Pronouncements

Leases with an initial term of twelve months or less are not recorded on the Consolidated Balance Sheets and are not material.

The components of lease expense were as follows (in thousands):

	Three Months Ended			Nine Months Ended
	September 30, 2019			September 30, 2019
Operating lease cost	$	3,851		$	11,215
Short-term lease cost		80			420
Variable lease cost		1,197			3,888
Sublease income		(54	)		(121	)
Total lease cost	$	5,074		$	15,402

Additional lease information is summarized in the following table (in thousands, except lease term and discount rate):

	Nine Months Ended
	September 30, 2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	9,111
Operating right-of-use assets obtained in exchange for lease obligations	$	17,770
Weighted-average remaining lease term - operating leases (years)		6.6
Weighted-average discount rate - operating leases		5.1	%

Future minimum lease payments under non-cancellable leases as of September 30, 2019 are as follows (in thousands):

2019	$	2,789
2020		15,546
2021		13,772
2022		13,321
2023		13,025
Thereafter		36,443
Total lease payments		94,896
Less imputed interest		(14,889	)
Present value of lease liabilities	$	80,007

Lease balances as of September 30, 2019 are as follows (in thousands):

Operating lease right-of-use assets	$	71,093

Short-term operating lease liabilities (1)	$	16,178
Non-current operating lease liabilities		63,829
Total operating lease liabilities	$	80,007

(1)	Included in accrued expenses and other current liabilities

The Company’s leases do not contain residual value guarantees, material restrictions or covenants, and all sublease transactions are not material.

Lease Disclosures Under Prior GAAP

Under prior GAAP, as of December 31, 2018, the Company’s future contractual obligations for operating leases were as follows (in thousands):

2019	$	12,498
2020		11,762
2021		10,145
2022		8,552
2023		7,856
Thereafter		22,222
Total minimum lease payments	$	73,035

Interim Consolidated Financial Statements (Tables)

9 Months Ended

Sep. 30, 2019

Accounting Policies [Abstract]

Summary of End-of-period Cash and Cash Equivalents and Cash, Cash Equivalents and Restricted Cash from Financial Statements

	Nine Months Ended September 30,
	2019		2018
Cash and cash equivalents	$	67,629	$	92,057
Restricted cash classified in (1):
Prepaid expenses and other current assets		717		—
Other assets		628		—
Cash, cash equivalents and restricted cash shown in statement of cash flows	$	68,974	$	92,057

(1)	Restricted cash consists primarily of collateral required for letters of credit. The short-term or long-term classification is determined in accordance with the expiration of the underlying lease as the letters of credit are non-cancellable while the leases are in effect.

Summary of Components of Lease Expense

The components of lease expense were as follows (in thousands):

	Three Months Ended			Nine Months Ended
	September 30, 2019			September 30, 2019
Operating lease cost	$	3,851		$	11,215
Short-term lease cost		80			420
Variable lease cost		1,197			3,888
Sublease income		(54	)		(121	)
Total lease cost	$	5,074		$	15,402

Summary of Additional Lease Information

Additional lease information is summarized in the following table (in thousands, except lease term and discount rate):

	Nine Months Ended
	September 30, 2019
Cash paid for amounts included in the measurement of operating lease liabilities	$	9,111
Operating right-of-use assets obtained in exchange for lease obligations	$	17,770
Weighted-average remaining lease term - operating leases (years)		6.6
Weighted-average discount rate - operating leases		5.1	%

Summary of Future Minimum Lease Payments Under Non-Cancellable Leases

Future minimum lease payments under non-cancellable leases as of September 30, 2019 are as follows (in thousands):

2019	$	2,789
2020		15,546
2021		13,772
2022		13,321
2023		13,025
Thereafter		36,443
Total lease payments		94,896
Less imputed interest		(14,889	)
Present value of lease liabilities	$	80,007

Summary of Lease Balances

Lease balances as of September 30, 2019 are as follows (in thousands):

Operating lease right-of-use assets	$	71,093

Short-term operating lease liabilities (1)	$	16,178
Non-current operating lease liabilities		63,829
Total operating lease liabilities	$	80,007

(1)	Included in accrued expenses and other current liabilities

Future Contractual Obligations for Operating Leases

Under prior GAAP, as of December 31, 2018, the Company’s future contractual obligations for operating leases were as follows (in thousands):

2019	$	12,498
2020		11,762
2021		10,145
2022		8,552
2023		7,856
Thereafter		22,222
Total minimum lease payments	$	73,035

Acquisitions (Tables) - SiriusDecisions, Inc [Member]

9 Months Ended

Sep. 30, 2019

Summary of Fair Value of Aggregate Consideration Paid

The following table summarizes the fair value of the aggregate consideration paid for SiriusDecisions (in thousands):

Cash paid at close (1)	$	246,801
Working capital adjustment (2)		(1,259	)
Total	$	245,542

(1)	The cash paid at close represents the gross contractual amount paid. Net cash paid, which accounts for the cash acquired of $7.9 million and the working capital adjustment of $1.3 million, was $237.7 million and is reflected as an investing activity in the Consolidated Statements of Cash Flows.

(2)	Amount represents the final amount receivable from the sellers based upon working capital as defined, which was received in the third quarter of 2019.

Summary of Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed

The following table summarizes the preliminary allocation of the purchase price to the fair value of the assets acquired and liabilities assumed for the acquisition of SiriusDecisions (in thousands):

Assets:
Cash and cash equivalents	$	7,858
Accounts receivable		19,237
Prepaids and other current assets		3,660
Fixed assets		4,169
Goodwill (1) (2)		154,906
Acquired intangible assets (3)		115,000
Other assets		265
Total assets		305,095
Liabilities:
Accounts payable and accrued liabilities		8,924
Deferred revenue		26,143
Deferred tax liability (2)		22,357
Long-term deferred revenue		1,037
Other long-term liabilities		1,092
Total liabilities		59,553
Net assets acquired	$	245,542

(1)	Goodwill represents the expected revenue and cost synergies from combining SiriusDecisions with Forrester as well as the value of the acquired workforce.

(2)	During the third quarter of 2019, the Company recorded a $1.8 million measurement period adjustment related to deferred taxes. The adjustment reduced the allocation of the purchase price to both deferred tax liabilities and goodwill.

(3)

Schedule of Unaudited Pro Forma Financial Information

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2019			2018			2019			2018
Pro forma total revenue	$	110,224		$	101,848		$	347,751		$	318,094
Pro forma net loss	$	(1,092	)	$	(2,511	)	$	(5,359	)	$	(9,951	)

Goodwill and Intangible Assets (Tables)

9 Months Ended

Sep. 30, 2019

Goodwill And Intangible Assets Disclosure [Abstract]

Summary of Change in Carrying Amount of Goodwill

The change in the carrying amount of goodwill for the nine months ended September 30, 2019 is summarized as follows (in thousands):

	Total
Balance at December 31, 2018	$	85,165
Acquisition		154,906
Translation adjustments		(1,245	)
Balance at September 30, 2019	$	238,826

Summary of Carrying Values of Finite-Lived Intangible Assets

The carrying values of finite-lived intangible assets are as follows (in thousands):

	September 30, 2019
	Gross				Net
	Carrying		Accumulated		Carrying
	Amount		Amortization		Amount
Amortizable intangible assets:
Customer relationships	$	109,551	$	37,784	$	71,767
Technology		16,577		5,347		11,230
Backlog		13,000		4,875		8,125
Trade name		12,438		645		11,793
Total	$	151,566	$	48,651	$	102,915

	December 31, 2018
	Gross				Net
	Carrying		Accumulated		Carrying
	Amount		Amortization		Amount
Amortizable intangible assets:
Customer relationships	$	32,823	$	31,604	$	1,219
Technology		3,610		295		3,315
Trade name		443		26		417
Total	$	36,876	$	31,925	$	4,951

Summary of Estimated Intangible Assets Amortization Expense

Estimated intangible asset amortization expense as of September 30, 2019 is as follows (in thousands):

Year ending December 31, 2019 (remainder)	$	5,653
Year ending December 31, 2020		18,822
Year ending December 31, 2021		12,322
Year ending December 31, 2022		10,984
Year ending December 31, 2023		10,812
Thereafter		44,322
Total	$	102,915

Debt (Tables)

9 Months Ended

Sep. 30, 2019

Debt Disclosure [Abstract]

Schedule of Maturities of Long-term Debt

The amount payable in each year as of September 30, 2019 is set forth in the table below (in thousands):

2019 (remainder)	$	1,563
2020		9,375
2021		12,500
2022		12,500
2023		15,625
Thereafter		68,750
Total remaining principal payments	$	120,313

Summary of Company’s Total Outstanding Borrowings

The following table summarizes the Company’s total outstanding borrowings as of the dates indicated (in thousands):

Description:	September 30, 2019			December 31, 2018
Term loan facility (1)	$	120,313		$	—
Revolving credit facility (1) (2)		14,000			—
Principal amount outstanding (3)		134,313			—
Less: Deferred financing fees		(2,364	)		—
Net carrying amount	$	131,949		$	—

(1)

(2)	The Company had $61.0 million of available borrowing capacity on the revolver (not including the expansion feature) as of September 30, 2019.

(3)	The weighted average annual effective rates on the Company's total debt outstanding for the three and nine months ended September 30, 2019, were 4.53% and 4.88%, respectively.

Accumulated Other Comprehensive Loss (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Schedule of Components of Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are as follows (in thousands):

				Total
	Cumulative			Accumulated
	Translation			Other Comprehensive
	Adjustment			Loss
Balance at January 1, 2019	$	(5,154	)	$	(5,154	)
Foreign currency translation		(1,450	)		(1,450	)
Balance at September 30, 2019	$	(6,604	)	$	(6,604	)

							Total
	Net Unrealized			Cumulative			Accumulated
	Loss on Marketable			Translation			Other Comprehensive
	Investments			Adjustment			Loss
Balance at January 1, 2018	$	(115	)	$	(1,897	)	$	(2,012	)
Reclassification of stranded tax effects from tax reform		(26	)		—			(26	)
Foreign currency translation		—			(2,293	)		(2,293	)
Unrealized gain on investments, net of tax of $4		12			—			12
Balance at September 30, 2018	$	(129	)	$	(4,190	)	$	(4,319	)

				Total
	Cumulative			Accumulated
	Translation			Other Comprehensive
	Adjustment			Loss
Balance at July 1, 2019	$	(4,990	)	$	(4,990	)
Foreign currency translation		(1,614	)		(1,614	)
Balance at September 30, 2019	$	(6,604	)	$	(6,604	)

							Total
	Net Unrealized			Cumulative			Accumulated
	Loss on Marketable			Translation			Other Comprehensive
	Investments			Adjustment			Loss
Balance at July 1, 2018	$	(194	)	$	(3,588	)	$	(3,782	)
Foreign currency translation		—			(602	)		(602	)
Unrealized gain on investments, net of tax of $21		65			—			65
Balance at September 30, 2018	$	(129	)	$	(4,190	)	$	(4,319	)

Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2019

Fair Value Disclosures [Abstract]

Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities

The following table represents the Company’s fair value hierarchy for its financial assets and liabilities that are measured at fair value on a recurring basis (in thousands):

	As of September 30, 2019
	Level 1		Level 2		Level 3			Total
Assets:
Money market funds (1)	$	5,367	$	—	$	—		$	5,367
Total Assets:	$	5,367	$	—	$	—		$	5,367

Liabilities
Contingent purchase price (2)	$	—	$	—	$	(2,443	)	$	(2,443	)
Total Liabilities:	$	—	$	—	$	(2,443	)	$	(2,443	)

	As of December 31, 2018
	Level 1		Level 2		Level 3			Total
Assets:
Money market funds (1)	$	255	$	—	$	—		$	255
Total Assets:	$	255	$	—	$	—		$	255

Liabilities
Contingent purchase price (2)	$	—	$	—	$	(4,196	)	$	(4,196	)
Total Liabilities:	$	—	$	—	$	(4,196	)	$	(4,196	)

(1)	Included in cash and cash equivalents.

(2)	$2.4 million and $1.8 million is included in accrued expenses and other current liabilities as of September 30, 2019 and December 31, 2018, respectively. $2.4 million is included in non-current liabilities as of December 31, 2018.

Summary of Changes in the Fair Value of Level 3 Contingent Consideration

Changes in the fair value of Level 3 contingent consideration for the nine months ended September 30, 2019 were as follows (in thousands):

	Contingent
	Consideration
Balance at December 31, 2018	$	(4,196	)
Fair value adjustment of contingent purchase price (1)		(57	)
Payment of contingent purchase price		1,769
Foreign exchange effect		41
Balance at September 30, 2019	$	(2,443	)

(1)

Net Income (Loss) Per Common Share (Tables)

9 Months Ended

Sep. 30, 2019

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Weighted Average Common Shares

Basic and diluted weighted average common shares are as follows (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Basic weighted average common shares outstanding		18,546		18,088		18,448		18,030
Weighted average common equivalent shares		—		345		—		323
Diluted weighted average common shares outstanding		18,546		18,433		18,448		18,353
Options and restricted stock units excluded from diluted weighted average share calculation as effect would have been anti-dilutive		1,090		1		1,086		10

Stockholders' Equity (Tables)

9 Months Ended

Sep. 30, 2019

Equity [Abstract]

Components of Stockholders' Equity

The components of stockholders’ equity are as follows (in thousands):

	Three Months Ended September 30, 2019
	Common Stock										Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital			Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at July 1, 2019		23,089	$	231	$	210,378		$	115,956			4,631	$	(171,889	)	$	(4,990	)	$	149,686
Issuance of common stock under stock plans, net		158		1		(794	)		—			—		—			—			(793	)
Stock-based compensation expense		—		—		3,072			—			—		—			—			3,072
Net loss		—		—		—			(2,699	)		—		—			—			(2,699	)
Foreign currency translation		—		—		—			—			—		—			(1,614	)		(1,614	)
Balance at September 30, 2019		23,247	$	232	$	212,656		$	113,257			4,631	$	(171,889	)	$	(6,604	)	$	147,652

	Three Months Ended September 30, 2018
	Common Stock									Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital		Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at July 1, 2018		22,564	$	226	$	189,554	$	125,698			4,624	$	(171,585	)	$	(3,782	)	$	140,111
Issuance of common stock under stock plans, net		329		3		5,129		—			—		—			—			5,132
Stock-based compensation expense		—		—		2,120		—			—		—			—			2,120
Repurchases of common stock		—		—		—		—			7		(304	)		—			(304	)
Dividends paid on common shares		—		—		—		(3,642	)		—		—			—			(3,642	)
Net income		—		—		—		3,950			—		—			—			3,950
Net change in marketable investments, net of tax		—		—		—		—			—		—			65			65
Foreign currency translation		—		—		—		—			—		—			(602	)		(602	)
Balance at September 30, 2018		22,893	$	229	$	196,803	$	126,006			4,631	$	(171,889	)	$	(4,319	)	$	146,830

	Nine Months Ended September 30, 2019
	Common Stock									Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital		Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at January 1, 2019		22,951	$	230	$	200,696	$	127,717			4,631	$	(171,889	)	$	(5,154	)	$	151,600
Issuance of common stock under stock plans, net		296		2		3,355		—			—		—			—			3,357
Stock-based compensation expense		—		—		8,605		—			—		—			—			8,605
Net loss		—		—		—		(14,460	)		—		—			—			(14,460	)
Foreign currency translation		—		—		—		—			—		—			(1,450	)		(1,450	)
Balance at September 30, 2019		23,247	$	232	$	212,656	$	113,257			4,631	$	(171,889	)	$	(6,604	)	$	147,652

	Nine Months Ended September 30, 2018
	Common Stock									Treasury Stock					Accumulated
	Number of Shares		$0.01 Par Value		Additional Paid-in Capital		Retained Earnings			Number of Shares		Cost			Other Comprehensive Income (Loss)			Total Equity
Balance at January 1, 2018		22,432	$	224	$	181,910	$	123,010			4,391	$	(161,943	)	$	(2,012	)	$	141,189
Issuance of common stock under stock plans, net		461		5		8,703		—			—		—			—			8,708
Cumulative effect adjustment due to adoption of new accounting pronouncements		—		—		—		3,830			—		—			(26	)		3,804
Stock-based compensation expense		—		—		6,190		—			—		—			—			6,190
Repurchases of common stock		—		—		—		—			240		(9,946	)		—			(9,946	)
Dividends paid on common shares		—		—		—		(10,839	)		—		—			—			(10,839	)
Net income		—		—		—		10,005			—		—			—			10,005
Net change in marketable investments, net of tax		—		—		—		—			—		—			12			12
Foreign currency translation		—		—		—		—			—		—			(2,293	)		(2,293	)
Balance at September 30, 2018		22,893	$	229	$	196,803	$	126,006			4,631	$	(171,889	)	$	(4,319	)	$	146,830

Schedule of Restricted Stock Unit Activity

Restricted stock unit activity for the nine months ended September 30, 2019 is presented below (in thousands, except per share data):

				Weighted-
				Average
	Number of			Grant Date
	Shares			Fair Value
Unvested at December 31, 2018		497		$	40.89
Granted		434			43.87
Vested		(186	)		39.40
Forfeited		(56	)		43.39
Unvested at September 30, 2019		689		$	42.96

Schedule of Stock Option Activity

Stock option activity for the nine months ended September 30, 2019 is presented below (in thousands, except per share data and contractual term):

				Weighted -		Weighted -
				Average		Average
				Exercise		Remaining		Aggregate
	Number			Price Per		Contractual		Intrinsic
	of Shares			Share		Term (in years)		Value
Outstanding at December 31, 2018		583		$	35.27
Granted		—			—
Exercised		(105	)		34.07
Forfeited		(20	)		35.38
Outstanding at September 30, 2019		458		$	35.54		4.32	$	33,163
Exercisable at September 30, 2019		443		$	35.55		4.24	$	31,430
Vested and expected to vest at September 30, 2019		458		$	35.54		4.32	$	33,163

Summary of Stock-Based Compensation Recorded in Expense Categories

Stock-based compensation was recorded in the following expense categories (in thousands):

	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2019		2018		2019		2018
Cost of services and fulfillment	$	1,782	$	1,001	$	4,812	$	3,128
Selling and marketing		441		261		1,366		752
General and administrative		849		858		2,427		2,311
Total	$	3,072	$	2,120	$	8,605	$	6,191

Shares Subject to Employee Stock Purchase Plan Valuation Assumptions

	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2019			2018			2019			2018
Average risk-free interest rate		1.89	%		2.34	%		1.89	%		1.80	%
Expected dividend yield		0.0	%		1.6	%		0.0	%		1.9	%
Expected life	0.5 Years			0.5 Years			0.5 Years			0.5 Years
Expected volatility		30	%		25	%		30	%		22	%
Weighted average fair value	$	8.29		$	10.87		$	8.29		$	8.72

Operating Segments (Tables)

9 Months Ended

Sep. 30, 2019

Segment Reporting [Abstract]

Schedule of Information about Reportable Segments

The Company is providing disaggregated revenue by product in the segment tables below (in thousands). The 2018 amounts have been reclassified to conform to the current presentation.

	Products		Research		Sirius Decisions		Consolidated
Three Months Ended September 30, 2019
Research services revenues
Research	$	—	$	40,315	$	14,708	$	55,023
Connect		13,819		—		437		14,256
Analytics		5,269		—		—		5,269
Total research services revenues		19,088		40,315		15,145		74,548

Advisory services and events revenues
Consulting		19,298		11,902		1,419		32,619
Events		1,201		—		228		1,429
Total advisory services and events revenues		20,499		11,902		1,647		34,048
Total segment revenues		39,587		52,217		16,792		108,596
Segment expenses		18,374		13,525		8,672		40,571
Contribution margin		21,213		38,692		8,120		68,025
Selling, marketing, administrative and other expenses								(61,617	)
Amortization of intangible assets								(5,654	)
Acquisition and integration costs								(2,394	)
Interest expense, other income and loss on investments								(1,794	)
Loss before income taxes							$	(3,434	)

	Products		Research		Sirius Decisions		Consolidated
Three Months Ended September 30, 2018
Research services revenues
Research	$	—	$	38,199	$	—	$	38,199
Connect		12,890		—		—		12,890
Analytics		5,243		—		—		5,243
Total research services revenues		18,133		38,199		—		56,332

Advisory services and events revenues
Consulting		15,888		11,755		—		27,643
Events		915		—		—		915
Total advisory services and events revenues		16,803		11,755		—		28,558
Total segment revenues		34,936		49,954		—		84,890
Segment expenses		17,800		13,109		—		30,909
Contribution margin		17,136		36,845		—		53,981
Selling, marketing, administrative and other expenses								(47,660	)
Amortization of intangible assets								(402	)
Acquisition and integration costs								(977	)
Other income and loss on investments								302
Income before income taxes							$	5,244

					Sirius
	Product		Research		Decisions		Consolidated
Nine Months Ended September 30, 2019
Research services revenues
Research	$	—	$	118,258	$	42,850	$	161,108
Connect		40,459		—		1,435		41,894
Analytics		16,434		—		—		16,434
Total research services revenues		56,893		118,258		44,285		219,436

Advisory services and events revenues
Consulting		56,156		38,173		4,094		98,423
Events		8,422		—		11,147		19,569
Total advisory services and events revenues		64,578		38,173		15,241		117,992
Total segment revenues		121,471		156,431		59,526		337,428
Segment expenses		59,982		41,301		33,580		134,863
Contribution margin		61,489		115,130		25,946		202,565
Selling, marketing, administrative and other expenses								(185,656	)
Amortization of intangible assets								(16,963	)
Acquisition and integration costs								(7,848	)
Interest expense, other expense and losses on investments								(6,631	)
Loss before income taxes							$	(14,533	)

					Sirius
	Products		Research		Decisions		Consolidated
Nine Months Ended September 30, 2018
Research services revenues
Research	$	—	$	113,897	$	—	$	113,897
Connect		37,992		—		—		37,992
Analytics		14,443		—		—		14,443
Total research services revenues		52,435		113,897		—		166,332

Advisory services and events revenues
Consulting		46,658		37,078		—		83,736
Events		8,924		—		—		8,924
Total advisory services and events revenues		55,582		37,078		—		92,660
Total segment revenues		108,017		150,975		—		258,992
Segment expenses		54,841		39,898		—		94,739
Contribution margin		53,176		111,077		—		164,253
Selling, marketing, administrative and other expenses								(148,496	)
Amortization of intangible assets								(770	)
Acquisition and integration costs								(1,306	)
Other income and losses on investments								410
Income before income taxes							$	14,091

Interim Consolidated Financial Statements - Summary of End-of-period Cash and Cash Equivalents and Cash, Cash Equivalents and Restricted Cash from Financial Statements (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Cash And Cash Equivalents [Abstract]
Cash and cash equivalents	$ 67,629	$ 140,296	$ 92,057
Restricted cash, current	$ 717
Restricted Cash, Current, Asset, Statement of Financial Position [Extensible List]	us-gaap:PrepaidExpenseAndOtherAssetsCurrent
Restricted cash, non-current	$ 628
Restricted Cash, Noncurrent, Asset, Statement of Financial Position [Extensible List]	us-gaap:OtherAssetsNoncurrent
Cash, cash equivalents and restricted cash shown in statement of cash flows	$ 68,974		$ 92,057

Interim Consolidated Financial Statements - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019	Jan. 03, 2019	Jan. 01, 2019
Summary Of Significant Accounting Policy [Line Items]
Operating lease right-of-use assets	$ 71,093	$ 71,093
Operating lease liabilities	80,007	$ 80,007
Lease package practical expedients		true
Option to extend description		Some of the Company’s leases include options to extend or terminate the lease. When determining the lease term, these options are included in the measurement and recognition of the Company’s ROU assets and lease liabilities when it is reasonably certain that the Company will exercise the option.
Topic 842 [Member]
Summary Of Significant Accounting Policy [Line Items]
Operating lease right-of-use assets				$ 53,300
Operating lease liabilities				60,800
Topic 842 [Member] \| Effect of Adoption [Member]
Summary Of Significant Accounting Policy [Line Items]
Deferred rent				$ 7,500
Topic 842 [Member] \| SiriusDecisions, Inc [Member]
Summary Of Significant Accounting Policy [Line Items]
Operating lease right-of-use assets			$ 10,400
Operating lease liabilities			$ 10,400
Topic 842 [Member] \| SiriusDecisions, Inc [Member] \| Facility Lease [Member]
Summary Of Significant Accounting Policy [Line Items]
Operating lease right-of-use asset impairments	$ 100	$ 400

Interim Consolidated Financial Statements - Summary of Components of Lease Expense (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2019
Leases [Abstract]
Operating lease cost	$ 3,851	$ 11,215
Short-term lease cost	80	420
Variable lease cost	1,197	3,888
Sublease income	(54)	(121)
Total lease cost	$ 5,074	$ 15,402

Interim Consolidated Financial Statements - Summary of Additional Lease Information (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Leases [Abstract]
Cash paid for amounts included in the measurement of operating lease liabilities	$ 9,111
Operating right-of-use assets obtained in exchange for lease obligations	$ 17,770
Weighted-average remaining lease term - operating leases (years)	6 years 7 months 6 days
Weighted-average discount rate - operating leases	5.10%

Interim Consolidated Financial Statements - Summary of Future Minimum Lease Payments Under Non-Cancellable Leases (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Operating Lease Liabilities Payments Due [Abstract]
2019	$ 2,789
2020	15,546
2021	13,772
2022	13,321
2023	13,025
Thereafter	36,443
Total lease payments	94,896
Less imputed interest	(14,889)
Present value of lease liabilities	$ 80,007

Interim Consolidated Financial Statements - Summary of Lease Balances (Detail) $ in Thousands	Sep. 30, 2019 USD ($)
Leases [Abstract]
Operating lease right-of-use assets	$ 71,093
Short term operating lease liabilities	$ 16,178
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	us-gaap:AccruedLiabilitiesCurrent
Non-current operating lease liabilities	$ 63,829
Total operating lease liabilities	$ 80,007

Interim Consolidated Financial Statements - Future Contractual Obligations for Operating Leases (Detail) $ in Thousands	Dec. 31, 2018 USD ($)
Leases [Abstract]
2019	$ 12,498
2020	11,762
2021	10,145
2022	8,552
2023	7,856
Thereafter	22,222
Total minimum lease payments	$ 73,035

Acquisitions - Additional Information (Detail)				3 Months Ended		6 Months Ended	9 Months Ended
Acquisitions - Additional Information (Detail)	Jan. 03, 2019 USD ($) Employee	Jul. 06, 2018 USD ($)	Jun. 22, 2018 USD ($)	Sep. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Jul. 06, 2018 CHF (SFr)
Business Acquisition [Line Items]
Goodwill				$ 238,826,000			$ 238,826,000			$ 85,165,000
SiriusDecisions, Inc [Member]
Business Acquisition [Line Items]
Revenue				16,800,000			59,500,000
Direct expenses including intangible amortization				22,200,000			$ 79,200,000
SocialGlimpz Inc. [Member]
Business Acquisition [Line Items]
Acquisition date			Jun. 22, 2018
Name of the business entity acquired							SocialGlimpz, Inc.
Description of acquired entity							On June 22, 2018, Forrester acquired substantially all of the assets of SocialGlimpz, Inc. (“GlimpzIt”), an artificial intelligence and machine-learning provider based in San Francisco. The acquisition is part of Forrester's plan to build a real-time customer experience or CX cloud solution, integrating a range of inputs to help companies monitor and improve customer experience. Forrester intends to deploy the GlimpzIt technology to extend the analytics engine in Forrester’s planned real-time CX cloud.
Purchase price paid			$ 1,300,000
Goodwill			700,000
Cash contingent to be paid on achievement of certain employment conditions			$ 300,000
Compensation expense to be recognized over related service period of employees			2 years
Cash contingent paid on achievement of certain employment conditions						$ 100,000
SocialGlimpz Inc. [Member] \| Technology [Member]
Business Acquisition [Line Items]
Intangible assets			$ 600,000
Estimated useful life			5 years
FeedbackNow [Member]
Business Acquisition [Line Items]
Acquisition date		Jul. 06, 2018
Purchase price paid		$ 8,400,000					$ 500,000
Percentage of issued and outstanding shares acquired		100.00%									100.00%
Acquisition price due and subject to indemnity provisions from seller		$ 1,500,000
Additional purchase price paid							800,000
Maximum consideration payable based on the financial performance of acquired company		2,500,000		4,300,000			4,300,000				SFr 4,200,000
Additional consideration payable to sellers based on financial performance				$ 1,800,000			1,800,000
Business acquisition undiscounted amounts could be payable, minimum		0
Contingent purchase price		$ 3,400,000
FeedbackNow [Member] \| Scenario, Forecast [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Additional consideration payable to sellers based on financial performance								$ 2,500,000	$ 1,800,000
SiriusDecisions, Inc [Member]
Business Acquisition [Line Items]
Purchase price paid	$ 246,801,000
Goodwill	$ 154,906,000
Percentage of issued and outstanding shares acquired	100.00%
Number of employees \| Employee	350
Consideration paid	$ 245,000,000
Acquisition costs recognized					$ 1,700,000		$ 1,700,000

Acquisitions - Summary of Fair Value of Aggregate Consideration Paid (Detail) - SiriusDecisions, Inc [Member] $ in Thousands	Jan. 03, 2019 USD ($)
Business Acquisition [Line Items]
Cash paid at close	$ 246,801
Working capital adjustment	(1,259)
Total	$ 245,542

Acquisitions - Summary of Fair Value of Aggregate Consideration Paid (Parenthetical) (Detail) - USD ($) $ in Thousands		9 Months Ended
	Jan. 03, 2019	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Net cash paid		$ 237,684	$ 9,250
SiriusDecisions, Inc [Member]
Business Acquisition [Line Items]
Cash acquired	$ 7,900
Net cash paid	237,700
Working capital adjustment	$ (1,259)

Acquisitions - Summary of Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 03, 2019	Dec. 31, 2018
Assets:
Goodwill	$ 238,826		$ 85,165
SiriusDecisions, Inc [Member]
Assets:
Cash and cash equivalents		$ 7,858
Accounts receivable		19,237
Prepaids and other current assets		3,660
Fixed assets		4,169
Goodwill		154,906
Acquired intangible assets		115,000
Other assets		265
Total assets		305,095
Liabilities:
Accounts payable and accrued liabilities		8,924
Deferred revenue		26,143
Deferred tax liability (2)		22,357
Long-term deferred revenue		1,037
Other long-term liabilities		1,092
Total liabilities		59,553
Net assets acquired		$ 245,542

Acquisitions - Summary of Preliminary Allocation of Purchase Price to Fair Value of Assets Acquired and Liabilities Assumed (Parenthetical) (Detail) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended
	Jan. 03, 2019	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Amortization of intangible assets		$ 5,654	$ 402	$ 16,963	$ 770
SiriusDecisions, Inc [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 115,000
Acquired intangible assets, Useful life	8 years 4 months 24 days
Amortization of intangible assets		5,400		$ 16,300
Reduction in deferred tax liabilities and goodwill due to measurement period adjustment		$ 1,800
SiriusDecisions, Inc [Member] \| Technology Asset Class [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 13,000
Acquired intangible assets, Useful life	3 years 2 months 12 days
SiriusDecisions, Inc [Member] \| Technology Asset Class [Member] \| Minimum [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Useful life	1 year
SiriusDecisions, Inc [Member] \| Technology Asset Class [Member] \| Maximum [Member]
Business Acquisition [Line Items]
Acquired intangible assets, Useful life	8 years
SiriusDecisions, Inc [Member] \| Customer Relationships [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 77,000
Acquired intangible assets, Useful life	9 years 3 months
SiriusDecisions, Inc [Member] \| Trade Names [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 12,000
Acquired intangible assets, Useful life	15 years 6 months
SiriusDecisions, Inc [Member] \| Backlog [Member]
Business Acquisition [Line Items]
Acquired intangible assets	$ 13,000
Acquired intangible assets, Useful life	2 years

Acquisitions - Schedule of Unaudited Pro Forma Financial Information (Detail) - SiriusDecisions, Inc [Member] - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Business Acquisition [Line Items]
Pro forma total revenue	$ 110,224	$ 101,848	$ 347,751	$ 318,094
Pro forma net loss	$ (1,092)	$ (2,511)	$ (5,359)	$ (9,951)

Goodwill and Intangible Assets - Summary of Change in Carrying Amount of Goodwill (Detail) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill, Beginning Balance	$ 85,165
Acquisition	154,906
Translation adjustments	(1,245)
Goodwill, Ending Balance	$ 238,826

Goodwill and Intangible Assets - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2019 USD ($)
Finite Lived Intangible Assets [Line Items]
Accumulated goodwill impairment losses	$ 0
SiriusDecisions, Inc [Member]
Finite Lived Intangible Assets [Line Items]
Intangible assets acquired	$ 115,000,000

Goodwill and Intangible Assets - Summary of Carrying Values of Finite-Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 151,566	$ 36,876
Accumulated Amortization	48,651	31,925
Total	102,915	4,951
Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	109,551	32,823
Accumulated Amortization	37,784	31,604
Total	71,767	1,219
Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	16,577	3,610
Accumulated Amortization	5,347	295
Total	11,230	3,315
Backlog [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	13,000
Accumulated Amortization	4,875
Total	8,125
Trade Name [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	12,438	443
Accumulated Amortization	645	26
Total	$ 11,793	$ 417

Goodwill and Intangible Assets - Summary of Estimated Intangible Assets Amortization Expense (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Finite Lived Intangible Assets Future Amortization Expense [Abstract]
Year ending December 31, 2019 (remainder)	$ 5,653
Year ending December 31, 2020	18,822
Year ending December 31, 2021	12,322
Year ending December 31, 2022	10,984
Year ending December 31, 2023	10,812
Thereafter	44,322
Total	$ 102,915	$ 4,951

Debt - Additional Information (Detail) - USD ($)	Jan. 03, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Credit facility, maximum borrowing capacity amount	$ 200,000,000
Aggregate principal amount		$ 134,313,000
Percentage of voting equity of subsidiaries	65.00%
Maximum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate	2.50%
Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate	1.50%
Minimum [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Interest rate	1.75%
Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate	0.75%
Term Loans [Member]
Debt Instrument [Line Items]
Aggregate principal amount	$ 125,000,000	120,313,000
Senior secured term loans	$ 125,000,000
Debt instrument maturity date	Jan. 03, 2024
Debt cost incurred related to term loans	$ 2,800,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Aggregate principal amount		$ 14,000,000
Line of credit facility, maximum borrowing capacity	75,000,000
Line of credit facility current borrowing capacity	$ 50,000,000
Credit facility maturity date	Jan. 03, 2024
Revolving Credit Facility [Member] \| Letters of Credit [Member]
Debt Instrument [Line Items]
Available for issuance of letter of credit	$ 5,000,000
Debt cost incurred related to revolving credit facility	$ 1,800,000
Debt instrument, amortized over the term	5 years
Revolving Credit Facility [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Increase (decrease) in line of credit facility	$ 50,000,000
Percentage of commitment fee on the unused portion of the facility	0.35%
Revolving Credit Facility [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Percentage of commitment fee on the unused portion of the facility	0.25%

Debt - Schedule of Maturities of Long-term Debt (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 03, 2019
Debt Instrument [Line Items]
Total remaining principal payments	$ 134,313
Term Loans [Member]
Debt Instrument [Line Items]
2019 (remainder)	1,563
2020	9,375
2021	12,500
2022	12,500
2023	15,625
Thereafter	68,750
Total remaining principal payments	$ 120,313	$ 125,000

Debt - Summary of Company's Total Outstanding Borrowings (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Jan. 03, 2019
Debt Instrument [Line Items]
Principal amount outstanding	$ 134,313
Less: Deferred financing fees	(2,364)
Net carrying amount	131,949
Term Loans [Member]
Debt Instrument [Line Items]
Principal amount outstanding	120,313	$ 125,000
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Principal amount outstanding	$ 14,000

Debt - Summary of Company's Total Outstanding Borrowings (Parenthetical) (Detail) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2019 USD ($)	Sep. 30, 2019 USD ($)
Debt Instrument [Line Items]
Line of credit facility, available borrowing capacity	$ 61.0	$ 61.0
Weighted average interest rate	4.53%	4.88%
Term Loans [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	4.375%	4.375%
Term Loans [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	2.125%	2.125%
Term Loans [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	2.25%	2.25%
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	4.3125%	4.3125%
Revolving Credit Facility [Member] \| LIBOR [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	2.0625%	2.0625%
Revolving Credit Facility [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Debt instrument interest rate	2.25%	2.25%

Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ 149,686	$ 140,111	$ 151,600	$ 141,189
Reclassification of stranded tax effects from tax reform				(26)
Foreign currency translation	(1,614)	(602)	(1,450)	(2,293)
Unrealized gain on investments, net of tax		65		12
Ending Balance	147,652	146,830	147,652	146,830
Net Unrealized Loss on Marketable Investments [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance		(194)		(115)
Reclassification of stranded tax effects from tax reform				(26)
Unrealized gain on investments, net of tax		65		12
Ending Balance		(129)		(129)
Cumulative Translation Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(4,990)	(3,588)	(5,154)	(1,897)
Foreign currency translation	(1,614)	(602)	(1,450)	(2,293)
Ending Balance	(6,604)	(4,190)	(6,604)	(4,190)
Total Accumulated Other Comprehensive Loss [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(4,990)	(3,782)	(5,154)	(2,012)
Foreign currency translation	(1,614)	(602)	(1,450)	(2,293)
Ending Balance	$ (6,604)	$ (4,319)	$ (6,604)	$ (4,319)

Accumulated Other Comprehensive Loss - Schedule of Components of Accumulated Other Comprehensive Loss (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018
Other Comprehensive Income Loss Tax Parenthetical Disclosures [Abstract]
Tax expense (benefit) on unrealized gain on investments	$ 21	$ 4

Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Assets:
Fair value of investments	$ 5,367	$ 255
Liabilities
Fair value of liabilities	(2,443)	(4,196)
Contingent Purchase Price [Member]
Liabilities
Fair value of liabilities	(2,443)	(4,196)
Money Market Funds [Member]
Assets:
Fair value of cash equivalents	5,367	255
Level 1 [Member]
Assets:
Fair value of investments	5,367	255
Level 1 [Member] \| Money Market Funds [Member]
Assets:
Fair value of cash equivalents	5,367	255
Level 3 [Member]
Liabilities
Fair value of liabilities	(2,443)	(4,196)
Level 3 [Member] \| Contingent Purchase Price [Member]
Liabilities
Fair value of liabilities	$ (2,443)	$ (4,196)

Fair Value Measurements - Summary of Company's Fair Value Hierarchy for its Financial Assets and Liabilities (Parenthetical) (Detail) - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	$ 2,443	$ 4,196
Accrued Expenses and Other Current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities	$ 2,400	1,800
Non-current Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair value of liabilities		$ 2,400

Fair Value Measurements - Summary of Changes in the Fair Value of Level 3 Contingent Consideration (Detail) - Level 3 [Member] - Contingent Consideration [Member] $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Beginning balance	$ (4,196)
Fair value adjustment of contingent purchase price	(57)
Payment of contingent purchase price	1,769
Foreign exchange effect	41
Ending balance	$ (2,443)

Fair Value Measurements - Summary of Changes in the Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - Level 3 [Member] - Contingent Consideration [Member] - FeedbackNow [Member]	Sep. 30, 2019
Discount Rate [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of contingent consideration discount rate	17.3
Revenue Volatility [Member]
Fair Value Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair value of contingent consideration discount rate	26.6

Non-Marketable Investments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Carrying value of the Company's non-marketable investments	$ 2,400,000		$ 2,400,000		$ 2,500,000
Losses from non-marketable investments			(100,000)	$ (100,000)
Distributions received from funds	$ 0	$ 0	$ 0	$ 0
Limited Partnerships Investments [Member] \| Minimum [Member]
Fair Value Investments Entities That Calculate Net Asset Value Per Share [Line Items]
Ownership interest of Company			5.00%

Contract Assets and Liabilities - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract assets	$ 0	$ 0	$ 0	$ 0
Contract with customer, contract duration			1 year
Deferred revenue recognized	21,200,000	24,700,000	$ 132,800,000	128,600,000
Revenue expected to be recognized	307,600,000		307,600,000
Amortization expense related to deferred commissions	$ 8,100,000	$ 7,200,000	$ 24,100,000	$ 22,400,000
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Contract with customer, expected payment term			one year

Contract Assets and Liabilities - Additional Information1 (Detail) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2019-10-01	Sep. 30, 2019
Minimum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, revenue expected to be recognized	12 months
Maximum [Member]
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Performance obligation, revenue expected to be recognized	24 months

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2019
Income Taxes [Line Items]
Income tax (benefit) expense	$ (735)	$ 1,294	$ (73)	$ 4,086
Effective income tax rate			0.50%	29.00%
Settlement of U.S. Competent Authority Claim [Member]
Income Taxes [Line Items]
Discrete tax expense			$ 200
Scenario, Forecast [Member] \| Maximum [Member]
Income Taxes [Line Items]
Effective income tax rate					5.00%
Scenario, Forecast [Member] \| Minimum [Member]
Income Taxes [Line Items]
Effective income tax rate					0.00%

Net Income (Loss) Per Common Share - Schedule of Basic and Diluted Weighted Average Common Shares (Detail) - shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Earnings Per Share [Line Items]
Basic weighted average common shares outstanding	18,546	18,088	18,448	18,030
Weighted average common equivalent shares		345		323
Diluted weighted average common shares outstanding	18,546	18,433	18,448	18,353
Options And Restricted Stock Units [Member]
Earnings Per Share [Line Items]
Options and restricted stock units excluded from diluted weighted average share calculation as effect would have been anti-dilutive	1,090	1	1,086	10

Stockholders' Equity - Components of Stockholders' Equity (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Beginning Balance	$ 149,686	$ 140,111	$ 151,600	$ 141,189
Issuance of common stock under stock plans, net	(793)	5,132	3,357	8,708
Cumulative effect adjustment due to adoption of new accounting pronouncements				3,804
Stock-based compensation expense	3,072	2,120	$ 8,605	6,190
Repurchases of common stock		(304)		$ (9,946)
Repurchase of common stock, Shares			0	200,000
Dividends paid on common shares		(3,642)		$ (10,839)
Net income (loss)	(2,699)	3,950	$ (14,460)	10,005
Net change in marketable investments, net of tax		65		12
Foreign currency translation	(1,614)	(602)	(1,450)	(2,293)
Ending Balance	147,652	146,830	147,652	146,830
Common Stock [Member]
Beginning Balance	$ 231	$ 226	$ 230	$ 224
Beginning Balance, Shares	23,089,000	22,564,000	22,951,000	22,432,000
Issuance of common stock under stock plans, net	$ 1	$ 3	$ 2	$ 5
Issuance of common stock under stock plans, net, Shares	158,000	329,000	296,000	461,000
Ending Balance	$ 232	$ 229	$ 232	$ 229
Ending Balance, Shares	23,247,000	22,893,000	23,247,000	22,893,000
Additional Paid-in Capital [Member]
Beginning Balance	$ 210,378	$ 189,554	$ 200,696	$ 181,910
Issuance of common stock under stock plans, net	(794)	5,129	3,355	8,703
Stock-based compensation expense	3,072	2,120	8,605	6,190
Ending Balance	212,656	196,803	212,656	196,803
Retained Earnings [Member]
Beginning Balance	115,956	125,698	127,717	123,010
Cumulative effect adjustment due to adoption of new accounting pronouncements				3,830
Dividends paid on common shares		(3,642)		(10,839)
Net income (loss)	(2,699)	3,950	(14,460)	10,005
Ending Balance	113,257	126,006	113,257	126,006
Treasury Stock [Member]
Beginning Balance	$ (171,889)	$ (171,585)	$ (171,889)	$ (161,943)
Beginning Balance, Shares	4,631,000	4,624,000	4,631,000	4,391,000
Repurchases of common stock		$ (304)		$ (9,946)
Repurchase of common stock, Shares		(7,000)		(240,000)
Ending Balance	$ (171,889)	$ (171,889)	$ (171,889)	$ (171,889)
Ending Balance, Shares	4,631,000	4,631,000	4,631,000	4,631,000
Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance	$ (4,990)	$ (3,782)	$ (5,154)	$ (2,012)
Cumulative effect adjustment due to adoption of new accounting pronouncements				(26)
Net change in marketable investments, net of tax		65		12
Foreign currency translation	(1,614)	(602)	(1,450)	(2,293)
Ending Balance	$ (6,604)	$ (4,319)	$ (6,604)	$ (4,319)

Stockholders' Equity - Schedule of Restricted Stock Unit Activity (Detail) - Restricted Stock Units (RSUs) [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2019 $ / shares shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of Shares, Unvested at December 31, 2018 \| shares	497
Number of Shares, Granted \| shares	434
Number of Shares, Vested \| shares	(186)
Number of Shares, Forfeited \| shares	(56)
Number of Shares, Unvested at September 30, 2019 \| shares	689
Weighted-Average Grant Date Fair Value, Unvested, Beginning Balance \| $ / shares	$ 40.89
Weighted-Average Grant Date Fair Value, Granted \| $ / shares	43.87
Weighted-Average Grant Date Fair Value, Vested \| $ / shares	39.40
Weighted-Average Grant Date Fair Value, Forfeited \| $ / shares	43.39
Weighted-Average Grant Date Fair Value, Unvested, Ending Balance \| $ / shares	$ 42.96

Stockholders' Equity - Schedule of Stock Option Activity (Detail) $ / shares in Units, shares in Thousands, $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Shares, Outstanding at December 31, 2018 \| shares	583
Number of Shares, Exercised \| shares	(105)
Number of Shares, Forfeited \| shares	(20)
Number of Shares, Outstanding at September 30, 2019 \| shares	458
Number of Shares, Exercisable at September 30, 2019 \| shares	443
Number of Shares, Vested and expected to vest at September 30, 2019 \| shares	458
Weighted - Average Exercise Price Per Share, Outstanding, Beginning balance \| $ / shares	$ 35.27
Weighted - Average Exercise Price Per Share, Exercised \| $ / shares	34.07
Weighted - Average Exercise Price Per Share, Forfeited \| $ / shares	35.38
Weighted - Average Exercise Price Per Share, Outstanding, Ending balance \| $ / shares	35.54
Weighted - Average Exercise Price Per Share, Exercisable at September 30, 2019 \| $ / shares	35.55
Weighted - Average Exercise Price Per Share, Vested and expected to vest at September 30, 2019 \| $ / shares	$ 35.54
Weighted - Average Remaining Contractual Term, Outstanding at September 30, 2019	4 years 3 months 25 days
Weighted - Average Remaining Contractual Term, Exercisable at September 30, 2019	4 years 2 months 26 days
Weighted - Average Remaining Contractual Term, Vested and expected to vest at September 30, 2019	4 years 3 months 25 days
Aggregate Intrinsic Value, Outstanding at September 30, 2019 \| $	$ 33,163
Aggregate Intrinsic Value, Exercisable at September 30, 2019 \| $	31,430
Aggregate Intrinsic Value, Vested and expected to vest at September 30, 2019 \| $	$ 33,163

Stockholders' Equity - Summary of Stock-Based Compensation Recorded in Expense Categories (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	$ 3,072	$ 2,120	$ 8,605	$ 6,191
Cost of Services and Fulfillment [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	1,782	1,001	4,812	3,128
Selling and Marketing [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	441	261	1,366	752
General and Administrative [Member]
Employee Service Share Based Compensation Allocation Of Recognized Period Costs [Line Items]
Total allocated share-based compensation expense	$ 849	$ 858	$ 2,427	$ 2,311

Stockholders' Equity - Shares Subject to Employee Stock Purchase Plan Valuation Assumptions (Detail) - Employee Stock Purchase Plan [Member] - $ / shares	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Average risk-free interest rate	1.89%	2.34%	1.89%	1.80%
Expected dividend yield	0.00%	1.60%	0.00%	1.90%
Expected life	6 months	6 months	6 months	6 months
Expected volatility	30.00%	25.00%	30.00%	22.00%
Weighted average fair value	$ 8.29	$ 10.87	$ 8.29	$ 8.72

Stockholders' Equity - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Dividend declared and paid per share			$ 0.20
Aggregate dividend declared for the year			$ 10,800,000
Authorized to purchase of common stock under the stock repurchase program		$ 535,000,000
Repurchase of common stock		0	200,000
Aggregate cost of repurchase of common stock	$ 300,000	$ 474,900,000	$ 10,000,000
Cumulative repurchase of common stock		16,300,000

Operating Segments - Schedule of Information about Reportable Segments (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Segment Reporting Information [Line Items]
Total revenues	$ 108,596	$ 84,890	$ 337,428	$ 258,992
Segment expenses	40,571	30,909	134,863	94,739
Contribution margin	68,025	53,981	202,565	164,253
Selling, marketing, administrative and other expenses	(61,617)	(47,660)	(185,656)	(148,496)
Amortization of intangible assets	(5,654)	(402)	(16,963)	(770)
Acquisition and integration costs	(2,394)	(977)	(7,848)	(1,306)
Interest expense, other income and loss on investments	(1,794)	302	(6,631)	410
Income (loss) before income taxes	(3,434)	5,244	(14,533)	14,091
Research [Member]
Segment Reporting Information [Line Items]
Total revenues	55,023	38,199	161,108	113,897
Connect [Member]
Segment Reporting Information [Line Items]
Total revenues	14,256	12,890	41,894	37,992
Analytics [Member]
Segment Reporting Information [Line Items]
Total revenues	5,269	5,243	16,434	14,443
Research Services [Member]
Segment Reporting Information [Line Items]
Total revenues	74,548	56,332	219,436	166,332
Consulting [Member]
Segment Reporting Information [Line Items]
Total revenues	32,619	27,643	98,423	83,736
Events [Member]
Segment Reporting Information [Line Items]
Total revenues	1,429	915	19,569	8,924
Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues	34,048	28,558	117,992	92,660
Products Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	39,587	34,936	121,471	108,017
Segment expenses	18,374	17,800	59,982	54,841
Contribution margin	21,213	17,136	61,489	53,176
Products Segment [Member] \| Connect [Member]
Segment Reporting Information [Line Items]
Total revenues	13,819	12,890	40,459	37,992
Products Segment [Member] \| Analytics [Member]
Segment Reporting Information [Line Items]
Total revenues	5,269	5,243	16,434	14,443
Products Segment [Member] \| Research Services [Member]
Segment Reporting Information [Line Items]
Total revenues	19,088	18,133	56,893	52,435
Products Segment [Member] \| Consulting [Member]
Segment Reporting Information [Line Items]
Total revenues	19,298	15,888	56,156	46,658
Products Segment [Member] \| Events [Member]
Segment Reporting Information [Line Items]
Total revenues	1,201	915	8,422	8,924
Products Segment [Member] \| Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues	20,499	16,803	64,578	55,582
Research Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	52,217	49,954	156,431	150,975
Segment expenses	13,525	13,109	41,301	39,898
Contribution margin	38,692	36,845	115,130	111,077
Research Segment [Member] \| Research [Member]
Segment Reporting Information [Line Items]
Total revenues	40,315	38,199	118,258	113,897
Research Segment [Member] \| Research Services [Member]
Segment Reporting Information [Line Items]
Total revenues	40,315	38,199	118,258	113,897
Research Segment [Member] \| Consulting [Member]
Segment Reporting Information [Line Items]
Total revenues	11,902	11,755	38,173	37,078
Research Segment [Member] \| Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues	11,902	$ 11,755	38,173	$ 37,078
Sirius Decisions Segment [Member]
Segment Reporting Information [Line Items]
Total revenues	16,792		59,526
Segment expenses	8,672		33,580
Contribution margin	8,120		25,946
Sirius Decisions Segment [Member] \| Research [Member]
Segment Reporting Information [Line Items]
Total revenues	14,708		42,850
Sirius Decisions Segment [Member] \| Connect [Member]
Segment Reporting Information [Line Items]
Total revenues	437		1,435
Sirius Decisions Segment [Member] \| Research Services [Member]
Segment Reporting Information [Line Items]
Total revenues	15,145		44,285
Sirius Decisions Segment [Member] \| Consulting [Member]
Segment Reporting Information [Line Items]
Total revenues	1,419		4,094
Sirius Decisions Segment [Member] \| Events [Member]
Segment Reporting Information [Line Items]
Total revenues	228		11,147
Sirius Decisions Segment [Member] \| Advisory Services and Events [Member]
Segment Reporting Information [Line Items]
Total revenues	$ 1,647		$ 15,241