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Document and Entity Information - USD ($)	9 Months Ended
Document and Entity Information - USD ($)	Sep. 30, 2011	Nov. 01, 2011	Jun. 30, 2010
Document and Entity Information [Abstract]
Entity Registrant Name	FORRESTER RESEARCH INC
Entity Central Index Key	0001023313
Document Type	10-Q
Document Period End Date	Sep. 30, 2011
Amendment Flag	false
Document Fiscal Year Focus	2011
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 441,000,000
Entity Common Stock, Shares Outstanding		22,673,000

Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Sep. 30, 2011	Dec. 31, 2010
Current Assets:
Cash and cash equivalents	$ 73,586	$ 86,927
Marketable investments (Note 4)	139,033	119,990
Accounts receivable, net	43,159	73,574
Deferred income taxes	1,790	4,089
Deferred commissions	9,406	12,598
Prepaid expenses and other current assets	16,181	16,733
Restricted cash	2,216	3,879
Total current assets	285,371	317,790
Long-term marketable securities (Note 4)	9,539	9,117
Restricted cash	0	11,609
Property and equipment, net	51,490	19,838
Deferred income taxes	4,550	7,779
Goodwill	71,677	67,958
Intangible assets, net	11,170	8,487
Non-marketable investments (Note 5)	7,684	7,359
Other assets	488	540
Total assets	441,969	450,477
Current Liabilities:
Accounts payable	5,037	3,644
Accrued expenses	27,959	36,485
Deferred revenue	117,547	131,521
Total current liabilities	150,543	171,650
Non-current liabilities	13,059	6,920
Total liabilities	163,602	178,570
Stockholders' Equity (Note 8):
Preferred stock, $.01 par value Authorized - 500 shares, issued and outstanding - none
Common stock, $.01 par value; Authorized - 125,000 shares; Issued - 30,779 and 30,500 as of September 30, 2011 and December 31, 2010, respectively; Outstanding - 22,564 and 22,812 as of September 30, 2011 and December 31, 2010, respectively	307	305
Additional paid--in capital	368,462	358,017
Retained earnings	95,765	81,652
Treasury stock - 8,215 and 7,688 as of September 30, 2011 and December 31, 2010, respectively, at cost	(181,000)	(162,595)
Accumulated other comprehensive loss	(5,167)	(5,472)
Total stockholders' equity	278,367	271,907
Total liabilities and stockholders' equity	$ 441,969	$ 450,477

Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares shares in Thousands	Sep. 30, 2011	Dec. 31, 2010
Stockholders' Equity (Note 8):
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, shares authorized	500	500
Preferred stock, shares issued
Preferred stock, shares outstanding
Common stock, par value	$ .01	$ .01
Common stock, shares authorized	125,000	125,000
Common stock, shares issued	30,779	30,500
Common stock, shares outstanding	22,564	22,812
Treasury stock, shares	8,215	7,688

Consolidated Statements of Income (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues:
Research services	$ 49,242	$ 42,895	$ 141,130	$ 123,063
Advisory services and other	20,532	16,882	67,836	60,547
Total revenues	69,774	59,777	208,966	183,610
Operating expenses:
Cost of services and fulfillment	25,071	22,399	78,593	69,026
Selling and marketing	24,927	20,228	76,401	61,036
General and administrative	7,928	9,489	25,176	24,413
Depreciation	1,420	943	3,335	2,740
Amortization of intangible assets	679	905	1,898	2,715
Total operating expenses	60,025	53,964	185,403	159,930
Income from operations	9,749	5,813	23,563	23,680
Other income (expense), net	378	(945)	273	1,278
Gains on investments, net	8	1,377	648	1,829
Income before income taxes	10,135	6,245	24,484	26,787
Income tax provision	4,403	2,541	10,371	10,409
Net income	$ 5,732	$ 3,704	$ 14,113	$ 16,378
Basic income per common share	$ 0.25	$ 0.16	$ 0.62	$ 0.73
Diluted income per common share	$ 0.25	$ 0.16	$ 0.61	$ 0.71
Basic weighted average common shares outstanding	22,620	22,462	22,672	22,456
Diluted weighted average common shares outstanding	23,082	23,107	23,179	23,040

Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010
Cash flows from operating activities:
Net income	$ 14,113	$ 16,378
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation	3,335	2,740
Amortization of intangible assets	1,898	2,715
Net gains from investments	(648)	(1,829)
Deferred income taxes	5,820	(537)
Stock-based compensation	3,093	3,686
Amortization of premium on investments	2,523	1,728
Foreign currency losses	1,202	683
Other non-cash items		89
Changes in assets and liabilities, net of acquisitions:
Accounts receivable	31,273	27,524
Deferred commissions	3,193	913
Prepaid expenses and other current assets	926	(3,295)
Accounts payable	(1,732)	1,927
Accrued expenses	(3,428)	(2,692)
Deferred revenue	(15,061)	(12,342)
Net cash provided by operating activities	46,507	37,688
Cash flows from investing activities:
Acquisitions	(7,164)	(1,660)
Purchases of property and equipment	(33,194)	(6,248)
Purchases of marketable investments	(81,008)	(105,102)
Proceeds from sales and maturities of marketable investments	58,888	118,235
Decrease in restricted cash	13,272	1,851
Other investing activity	307	314
Net cash provided by (used in) investing activities	(48,899)	7,390
Cash flows from financing activities:
Proceeds from issuance of common stock under employee equity incentive plans	7,017	10,773
Excess tax benefits from stock-based compensation	432	399
Repurchases of common stock	(18,405)	(13,951)
Net cash used in financing activities	(10,956)	(2,779)
Effect of exchange rate changes on cash and cash equivalents	7	(2,004)
Net increase (decrease) in cash and cash equivalents	(13,341)	40,295
Cash and cash equivalents, beginning of period	86,927	97,805
Cash and cash equivalents, end of period	$ 73,586	$ 138,100

Interim Consolidated Financial Statements	9 Months Ended
Interim Consolidated Financial Statements	Sep. 30, 2011
Interim Consolidated Financial Statements [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, 2010. In the opinion of management, all adjustments (consisting of normal recurring adjustments) considered necessary for a fair presentation of the financial position, results of operations, 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, 2011 may not be indicative of the results for the year ending December 31, 2011, or any other period.

- Definition

The entire disclosure for organization, consolidation and basis of presentation of financial statements disclosure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 51
-Paragraph 2-6
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Statement of Position (SOP)
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-Number 94-6
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+ Details

Revenue Recognition	9 Months Ended
Revenue Recognition	Sep. 30, 2011
Revenue Recognition [Abstract]
Revenue Recognition	Note 2 — Revenue Recognition Effective January 1, 2011 the Company adopted Update No. 2009-13, “Multiple-Deliverable Revenue Arrangements — a consensus of the FASB Emerging Issues Task Force” (ASU 2009-13) for contracts entered into or materially modified after that date. ASU 2009-13 updates the previous multiple-element revenue arrangements guidance. The revised guidance primarily provides three significant changes: 1) it eliminates the need for objective and reliable evidence of the fair value of the undelivered element in order for a delivered item to be treated as a separate unit of accounting; 2) it eliminates the residual method to allocate the arrangement consideration; and, 3) it modifies the fair value requirements of EITF Issue 00-21 by providing “best estimate of selling price” in addition to vendor specific objective evidence and vendor objective evidence for determining the selling price of a deliverable. In addition, the guidance also expands the disclosure requirements for revenue recognition. The adoption of ASU 2009-13 did not have a material impact on the Company’s financial position, results of operations or cash flows. Forrester generates revenues from licensing research (including our data products), performing advisory services and consulting projects and hosting events. Forrester executes contracts that govern the terms and conditions of each arrangement. Revenues are recognized when persuasive evidence of an arrangement exists, the fee is fixed or determinable, services have been provided to the customer, and collectability is reasonably assured. Revenue contracts may include either a single product or service or a combination of multiple products and services. Revenues from contracts that contain multiple products and services are allocated among the separate units of accounting based on their relative selling prices; however, the amount recognized is limited to the amount that is not contingent on future performance conditions. The Company obtains the selling prices of its products and services based on an analysis of standalone sales of these products and services during the year. Research service revenues are recognized ratably over the term of the contract. Advisory service revenues are recognized when the customer receives the agreed upon deliverable and consulting project revenues, which are short-term in nature and based upon fixed-fee agreements, are recognized as the services are provided. Losses on consulting project contracts, if any, would be recognized in the period in which the loss first becomes probable and reasonably estimable. Reimbursed out-of-pocket expenses are recorded as advisory services revenue. Event revenues are recognized upon completion of the event. Annual subscriptions to our RoleView research include access to all or a designated portion of our research, and depending on the type of license, membership in one or more of our Forrester leadership boards, unlimited phone or email analyst inquiry, unlimited participation in Forrester Teleconferences, and the right to attend one event. Contracts for RoleView research entered into prior to the adoption of ASU 2009-13 on January 1, 2011, were accounted for as one unit of accounting and recognized ratably as research services revenue over the membership period. Contracts for RoleView research entered into or significantly modified after January 1, 2011 are accounted for as two units of accounting: 1) the event ticket and 2) the remaining research services that are delivered throughout the contract period, based on the new guidance that permits alternative methods of determining selling price as it relates to the components that we do not sell on a standalone basis, such as research services in this case. Arrangement consideration is allocated to each of these elements based upon their relative selling prices, which is based on standalone sales of event tickets and the estimated selling price of the remaining research services. Annual subscriptions to our data products include access to designated survey data products and access to a data specialist, which are delivered throughout the year, and are accounted for as one unit of accounting and recognized ratably as research services revenue over the membership period. Clients are offered a service guarantee, which gives them the right to cancel their contracts prior to the end of the contract term and receive a refund for unused products or services.

Acquisition

9 Months Ended

Sep. 30, 2011

Acquisition [Abstract]

Acquisition

Note 3 — Acquisition

On May 12, 2011, Forrester acquired Springboard Research (“Springboard”), a provider of research and advisory services focused on Asia Pacific and emerging markets. Springboard was a former division of Knowledge Platform, Inc. The acquisition of the Springboard business further supports Forrester’s role-based strategy and expands Forrester’s coverage in the Asia Pacific region. The total purchase price was approximately $9.0 million, of which approximately $6.7 million was paid on the acquisition date and $2.3 million (the “Holdback”) is payable at various times through June 1, 2013, subject to possible reduction to satisfy indemnification claims and specified contingencies. Of the $2.3 million Holdback, up to $0.9 million could be retained by the Company if certain key employees do not remain with the Company through May 12, 2012 or if the Company is not able to occupy one of Springboard’s facilities through September 15, 2012. As of September 30, 2011, $1.2 million and $0.9 million of the Holdback remains in accrued expenses and non-current liabilities, respectively, in the Consolidated Balance Sheets. The results of Springboard, which were not material to the consolidated financial statements, have been included in Forrester’s consolidated financial statements since May 12, 2011 in the Technology Industry Client Group segment. Pro forma financial information has not been provided as it is not material to the consolidated results of operations.

A summary of the purchase price allocation for Springboard is as follows (in thousands):


Assets:
Cash	$	85
Accounts receivable		561
Other current assets		285
Goodwill		3,695
Intangible assets		4,815

Total assets		9,441

Liabilities:
Accrued expenses		160
Deferred revenue		312

Total liabilities		472

Net assets acquired	$	8,969

Approximately $2.1 million of the goodwill is deductible for tax purposes. The Company believes the goodwill reflects its expectations of synergistic revenue opportunities from the acquisition and the value of the acquired workforce.

Intangible assets are amortized according to the expected cash flows to be received. The following are the identifiable intangible assets acquired and their respective weighted average lives (dollars in thousands):


			Useful
	Assigned		Life
	Value		(in years)
Customer relationships	$	3,605		7.5
Research content		1,080		1.5
Backlog		130		1.0

	$	4,815

- Definition

The entire disclosure for a business combination (or series of individually immaterial business combinations) completed during the period, including background, timing, and recognized assets and liabilities. The disclosure may include leverage buyout transactions (as applicable).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Emerging Issues Task Force (EITF)
-Number 88-16
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 141
-Paragraph 51, 52
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+ Details

Marketable Investments

9 Months Ended

Sep. 30, 2011

Marketable Investments [Abstract]

Marketable Investments

Note 4 — Marketable Investments

The following table summarizes the Company’s marketable investments (in thousands):


			Gross		Gross
	Amortized		Unrealized		Unrealized			Market
	Cost		Gains		Losses			Value
September 30, 2011
Available-for-sale securities
State and municipal obligations	$	10,828	$	11	$	(6	)		10,833
Federal agency and corporate obligations		128,458		169		(427	)		128,200

Total short-term available-for-sale securities		139,286		180		(433	)		139,033
ARS, long-term		11,000		—		(1,461	)		9,539

Total available-for-sale securities	$	150,286	$	180	$	(1,894	)	$	148,572


			Gross		Gross
	Amortized		Unrealized		Unrealized			Market
	Cost		Gains		Losses			Value
December 31, 2010
Available-for-sale securities
State and municipal obligations	$	12,011	$	23	$	(25	)	$	12,009
Federal agency and corporate obligations		107,669		483		(171	)		107,981

Total short-term available-for-sale securities		119,680		506		(196	)		119,990
ARS, long-term		11,000		—		(1,883	)		9,117

Total available-for-sale securities	$	130,680	$	506	$	(2,079	)	$	129,107

Realized gains and losses on securities are included in earnings and are determined using the specific identification method. Realized gains or losses on the sale of the Company’s federal agency, state, municipal and corporate obligations were not material in the three and nine months ended September 30, 2011 or 2010.

The following table summarizes the maturity periods of the marketable securities in the Company’s portfolio as of September 30, 2011. In February 2008, certain auction rate securities (“ARS”) that Forrester held experienced failed auctions that limited the liquidity of these securities. These auction failures have continued and based on current market conditions, it is likely that auction failures will continue. The following table reflects the ARS at their contractual maturity dates of between 2024 and 2034 (in thousands).


	FY 2011		FY 2012		FY2013		Thereafter		Total
Federal agency and corporate obligations	$	21,285	$	57,713	$	48,194	$	1,008	$	128,200
State and municipal obligations		5,133		5,700		—		—		10,833
ARS				—		—		9,539		9,539

Total	$	26,418	$	63,413	$	48,194	$	10,547	$	148,572

The following table shows the gross unrealized losses and market value of Forrester’s available-for-sale securities with unrealized losses that are not deemed to be other-than-temporary, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position (in thousands):


	As of September 30, 2011
	Less Than 12 Months				12 Months or Greater
	Market		Unrealized		Market		Unrealized
	Value		Losses		Value		Losses
State and municipal bonds	$	1,113	$	6	$	—	$	—
Federal agency and corporate obligations		67,015		427		—		—
ARS		—		—		9,539		1,461

Total	$	68,128	$	433	$	9,539	$	1,461


	As of December 31, 2010
	Less Than 12 Months				12 Months or Greater
	Market		Unrealized		Market		Unrealized
	Value		Losses		Value		Losses
State and municipal bonds	$	3,258	$	25	$	—	$	—
Federal agency and corporate obligations		45,928		171		—		—
ARS		—		—		9,117		1,883

Total	$	49,186	$	196	$	9,117	$	1,883

Fair Value

The Company measures certain financial assets at fair value on a recurring basis, including cash equivalents, available-for-sale securities and trading securities. 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.

The following table represents the Company’s fair value hierarchy for its financial assets (cash equivalents and investments) measured at fair value on a recurring basis as of September 30, 2011 and December 31, 2010 (in thousands):


	As of September 30, 2011
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	4,364	$	—	$	—	$	4,364
Federal agency and corporate obligations (2)		—		138,027		—		138,027
State and municipal obligations		—		10,834		9,538		20,372

Total	$	4,364	$	148,861	$	9,538	$	162,763


	As of December 31, 2010
	Level 1		Level 2		Level 3		Total
Money market funds (1)	$	25,222	$	—	$	—	$	25,222
Federal agency and corporate obligations		—		107,981		—		107,981
State and municipal obligations		—		12,009		9,117		21,126

Total	$	25,222	$	119,990	$	9,117	$	154,329


(1)		Included in cash and cash equivalents.

(2)		$9.8 million included in cash and cash equivalents as original maturities at the time of purchase were 90 days or less.

Level 2 assets consist of the Company’s entire portfolio of federal, state, municipal and corporate bonds, excluding those municipal bonds described below with an auction reset feature. Level 2 assets have been initially valued at the transaction price and subsequently valued, at the end of each reporting period, typically utilizing third party pricing services or other market observable data. The pricing services utilize industry standard valuation methods, including both income and market based approaches and observable market inputs to determine value. These observable market inputs include reportable trades, benchmark yields, credit spreads, broker/dealer quotes, bids, offers, current spot rates and other industry and economic events.

Level 3 assets at September 30, 2011 consist entirely of municipal bonds with an auction reset feature (ARS). Prior to 2008, the fair value of the ARS investments approximated par value due to the frequent resets through the auction process. While the Company continues to earn interest on its ARS investments at the contractual rate, these investments trade infrequently and therefore do not have a readily determinable market value. Accordingly, the estimated fair value of the ARS no longer approximates par value. At September 30, 2011, the Company held ARS with one investment advisor. The Company values the ARS using a discounted cash flow model that includes estimates of interest rates, timing and amount of cash flows, credit and liquidity premiums and expected holding periods of the securities, which is considered a Level 3 valuation. The valuation resulted in an unrealized loss recorded in other comprehensive loss in the Consolidated Balance Sheets of $1.5 million at September 30, 2011 and $1.9 million at December 31, 2010. The Company believes that the loss is temporary due to the strong underlying credit rating of the securities and the fact that the Company does not intend to sell the securities and is not likely to be required to sell the securities. The assumptions used in valuing the ARS are volatile and subject to change as the underlying sources of these assumptions and market conditions change.

Through July 1, 2010, the Company also held ARS with UBS AG (UBS). Historically, UBS provided a valuation utilizing Level 3 inputs for the ARS investments. UBS utilized a discounted cash flow approach to arrive at its valuation, which was corroborated by a separate and comparable discounted cash flow analysis prepared by the Company. The assumptions used in preparing the discounted cash flow model included estimates, based on data available at each balance sheet date, of interest rates, timing and amount of cash flows, credit and liquidity premiums, and expected holding periods of the ARS. In November 2008, the Company accepted an offer (the “Right”) from UBS entitling the Company to sell at par value ARS originally purchased from UBS at any time during a two-year period from June 30, 2010 through July 2, 2012. The Company valued the Right as an asset using a discounted cash flow approach including estimates of interest rates and timing and amount of cash flows, adjusted for any bearer risk associated with UBS’s financial ability to repurchase the ARS beginning June 30, 2010, based on data available at each balance sheet date. The combined fair value of the Right and the UBS ARS historically equaled the par value of the UBS ARS. The remaining $5.4 million of par value UBS ARS at June 30, 2010 were sold to UBS at par under the Right on July 1, 2010.

The following table provides a summary of changes in fair value of the Company’s Level 3 financial assets for the nine months ended September 30, 2011 and 2010 (in thousands):


	ARS
Balance at December 31, 2010	$	9,117
Sales/Maturities		—
Total gains (losses):
Included in other comprehensive income		422
Included in earnings		—
Balance at September 30, 2011	$	9,539


	UBS
	Right			ARS
Balance at December 31, 2009	$	2,100		$	39,525
Sales/Maturities		—			(31,675	)
Total gains (losses):
Included in other comprehensive income		—			(16	)
Included in earnings		(2,100	)		2,100

Balance at September 30, 2010	$	—		$	9,934

Non-Marketable Investments	9 Months Ended
Non-Marketable Investments	Sep. 30, 2011
Non-Marketable Investments [Abstract]
Non-Marketable Investments	Note 5— Non-Marketable Investments At September 30, 2011 and December 31, 2010, the carrying value of the Company’s non-marketable investments, which were composed primarily of interests in technology-related private equity funds, were $7.7 million and $7.4 million, respectively. One of the Company’s investments, with a book value of $1.6 million and $1.7 million at September 30, 2011 and December 31, 2010, respectively, is being accounted for using the cost method and, accordingly, is valued at cost unless an other-than-temporary impairment in its value occurs. The other investments 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. The Company recorded a gain from its non-marketable investments of $0.6 million and $1.8 million during the nine months ended September 30, 2011 and 2010, respectively, which are included in gains on investments, net in the Consolidated Statements of Income. Gains from non-marketable investments were insignificant during the three months ended September 30, 2011 and were $1.4 million during the three months ended September 30, 2010.

Reorganization

9 Months Ended

Sep. 30, 2011

Reorganization [Abstract]

Reorganization

Note 6 — Reorganization

The following table rolls forward the activity in the reorganization accrual for the nine months ended September 30, 2011 (in thousands):


	Facility
	Consolidation			Total
Accrual at December 31, 2010	$	446		$	446
Cash payments		(446	)		(446	)

Accrual at September 30, 2011	$	—		$	—

- Definition

The entire disclosure for restructuring and related activities. Description of restructuring activities such as exit and disposal activities, include facts and circumstances leading to the plan, the expected plan completion date, the major types of costs associated with the plan activities, total expected costs, the accrual balance at the end of the period, and the periods over which the remaining accrual will be settled.

+ References + Details

Net Income Per Common Share

9 Months Ended

Sep. 30, 2011

Net Income Per Common Share [Abstract]

Net Income Per Common Share

Note 7 — Net Income Per Common Share

Basic net income per common share is computed by dividing net income by the basic weighted average number of common shares outstanding during the period. Diluted net income per common share is computed by dividing net income 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 options and vesting of restricted stock units when dilutive.

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


	Three Months Ended				Nine Months Ended
	September 30,				September 30,
	2011		2010		2011		2010
Basic weighted average common shares outstanding		22,620		22,462		22,672		22,456
Weighted average common equivalent shares		462		645		507		584

Diluted weighted average common shares outstanding		23,082		23,107		23,179		23,040


Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive		447		344		209		490

Stockholders Equity

9 Months Ended

Sep. 30, 2011

Stockholders' Equity [Abstract]

Stockholders' Equity

Note 8 — Stockholders’ Equity

Comprehensive Income

The components of total comprehensive income for the three and nine months ended September 30, 2011 and 2010 are as follows (in thousands):


	Three Months Ended					Nine Months Ended
	September 30,					September 30,
	2011			2010		2011		2010
Net income	$	5,732		$	3,704	$	14,113	$	16,378
Cumulative translation adjustment		(2,593	)		3,637		298		(1,785	)
Unrealized gain (loss) on marketable investments, net of tax		(197	)		103		7		(140	)

Total comprehensive income	$	2,942		$	7,444	$	14,418	$	14,453

Equity Plans

Stock option activity for the nine months ended September 30, 2011 is presented below (in thousands, except per share data):


				Weighted -		Weighted -
				Average		Average
				Exercise		Remaining		Aggregate
	Number			Price Per		Contractual		Intrinsic
	of Shares			Share		Term (in years)		Value
Outstanding at December 31, 2010		2,215		$	26.00
Granted		345			34.56
Exercised		(222	)		25.21
Forfeited		(64	)		31.30

Outstanding at September 30, 2011		2,274		$	27.22		6.59	$	12,771

Exercisable at September 30, 2011		1,373		$	24.99		5.24	$	10,332

Restricted stock unit activity for the nine months ended September 30, 2011 is presented below (in thousands, except per share data):


				Weighted-
				Average
				Grant Date
	RSUs			Fair Value
Unvested at December 31, 2010		192		$	27.64
Granted		116			33.19
Vested or settled		(9	)		29.86
Forfeited		(20	)		27.90

Unvested at September 30, 2011		279		$	29.86

Stock-Based Compensation

Forrester recognizes the fair value of stock-based compensation in net income 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,
	2011		2010		2011		2010
Cost of services and fulfillment	$	678	$	531	$	1,325	$	1,588
Selling and marketing		294		238		686		708
General and administrative		440		387		1,082		1,390

Total	$	1,412	$	1,156	$	3,093	$	3,686

In 2009, the Company issued to its employees 95,496 performance-based RSUs. The vesting of the RSUs is subject to performance criteria and will vest at 100% or 40% on April 1, 2012, or the RSUs could be forfeited, depending on whether specified revenue growth and certain operating margin targets related to full year 2011 performance are achieved. Compensation expense in 2009, 2010 and the three months ended March 31, 2011 was recognized based on an estimate of 100% vesting of the RSUs. During the three months ended June 30, 2011, the Company modified its assessment of the likelihood of vesting to the 40% level and recorded a credit, to stock-based compensation expense, of approximately $0.8 million during the three months ended June 30, 2011 resulting from the change in estimate. Compensation expense in the three months ended September 30, 2011 continued to be recognized based on an estimate of 40% vesting.

Forrester utilizes the Black-Scholes valuation model for estimating the fair value of stock-based compensation. Options granted under the equity incentive plans and shares subject to purchase under the employee stock purchase plan were valued using the following assumptions:


	Three Months Ended						Three Months Ended
	September 30, 2011						September 30, 2010
	Equity Incentive			Employee Stock			Equity Incentive			Employee Stock
	Plans			Purchase Plan			Plans			Purchase Plan
Average risk-free interest rate		1.11	%		0.08	%		1.37	%		0.20	%
Expected dividend yield		None			None			None			None
Expected life		3.5 Years			0.5 Years			3.5 Years			0.5 Years
Expected volatility		40	%		28	%		40	%		25	%
Weighted average fair value	$	10.01		$	7.56		$	9.49		$	6.87


	Nine Months Ended						Nine Months Ended
	September 30, 2011						September 30, 2010
	Equity Incentive			Employee Stock			Equity Incentive			Employee Stock
	Plans			Purchase Plan			Plans			Purchase Plan
Average risk-free interest rate		1.29	%		0.14	%		2.02	%		0.17	%
Expected dividend yield		None			None			None			None
Expected life		3.5 Years			0.5 Years			3.6 Years			0.5 Years
Expected volatility		40	%		28	%		40	%		25	%
Weighted average fair value	$	10.53		$	7.55		$	9.63		$	6.23

Treasury Stock

Forrester’s Board of Directors has authorized an aggregate $260 million to purchase common stock under the stock repurchase program. The shares repurchased may be used, among other things, in connection with Forrester’s employee and director equity incentive and purchase plans. As of September 30, 2011, Forrester had repurchased approximately 8.2 million shares of common stock at an aggregate cost of approximately $181.0 million.

- Definition

The entire disclosure for shareholders' equity, comprised of portions attributable to the parent entity and noncontrolling interest, if any, including other comprehensive income (as applicable). Including, but not limited to: (1) balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings; (2) accumulated balance for each classification of other comprehensive income and total amount of comprehensive income; (3) amount and nature of changes in separate accounts, including the number of shares authorized and outstanding, number of shares issued upon exercise and conversion, and for other comprehensive income, the adjustments for reclassifications to net income; (4) rights and privileges of each class of stock authorized; (5) basis of treasury stock, if other than cost, and amounts paid and accounting treatment for treasury stock purchased significantly in excess of market; (6) dividends paid or payable per share and in the aggregate for each class of stock for each period presented; (7) dividend restrictions and accumulated preferred dividends in arrears (in aggregate and per share amount); (8) retained earnings appropriations or restrictions, such as dividend restrictions; (9) impact of change in accounting principle, initial adoption of new accounting principle and correction of an error in previously issued financial statements; (10) shares held in trust for Employee Stock Ownership Plan (ESOP); (11) deferred compensation related to issuance of capital stock; (12) note received for issuance of stock; (13) unamortized discount on shares; (14) description, terms, and number of warrants or rights outstanding; (15) shares under subscription and subscription receivables, effective date of new retained earnings after quasi-reorganization and deficit eliminated by quasi-reorganization and, for a period of at least ten years after the effective date, the point in time from which the new retained dates; and (16) retroactive effective of subsequent change in capital structure.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Principles Board Opinion (APB)
-Number 12
-Paragraph 10
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 04
-Article 3

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 4
-Section 08
-Paragraph d

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher AICPA
-Name Accounting Research Bulletin (ARB)
-Number 43
-Chapter 1
-Section B
-Paragraph 7, 11A
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 3, 4, 5, 6, 7, 8
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Article 4

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 5
-Paragraph 15
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30, 31
-Article 5

Reference 9: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section E

Reference 10: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 4
-Section C

Reference 11: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187085-122770

Reference 12: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21463-112644

Reference 13: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21475-112644

Reference 14: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21484-112644

Reference 15: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 11
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21564-112644

Reference 16: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21488-112644

Reference 17: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(d),(e))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 18: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=6928386&loc=d3e21506-112644

Reference 19: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6405834&loc=d3e23285-112656

Reference 20: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SAB TOPIC 4.E)
-URI http://asc.fasb.org/extlink&oid=6228006&loc=d3e74512-122707

Reference 21: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Preferred Stock
-URI http://asc.fasb.org/extlink&oid=6521494

Reference 22: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.29-31)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

Reference 23: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 4
-Subparagraph (SAB TOPIC 4.C)
-URI http://asc.fasb.org/extlink&oid=6959260&loc=d3e187143-122770

+ Details

Income Taxes	9 Months Ended
Income Taxes	Sep. 30, 2011
Income Taxes [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, foreign exchange gains or losses on the remeasurement of deferred tax liabilities and tax benefits related to disqualifying dispositions of incentive stock options are treated as discrete items and are recorded in the period in which they arise.

- Definition

The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 08
-Paragraph h
-Article 4

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 136, 172
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 109
-Paragraph 43, 44, 45, 46, 47, 48, 49
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32718-109319

Reference 5: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32639-109319

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=6881521&loc=d3e23780-122690

Reference 7: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319

Reference 8: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319

+ Details

Operating Segments

9 Months Ended

Sep. 30, 2011

Operating Segments [Abstract]

Operating Segments

Note 10 — Operating Segments

Forrester is organized into three client groups with each client group responsible for writing relevant research for the roles within the client organization on a worldwide basis. The three client groups, which are considered operating segments, are: Business Technology (“BT”) (formerly called Information Technology or IT), Technology Industry (“TI”), and Marketing and Strategy (“M&S”). In addition, the Company’s Events segment supports all three client groups. All of the client groups generate revenues through sales of research, advisory and other service offerings targeted at specific roles within their targeted clients. Each of the client groups consists of research personnel focused primarily on issues relevant to particular roles and to the day-to-day responsibilities of persons within the roles. Amounts included in the “Events” segment relate to the operations of the events production department. Revenue reported in the Events segment consists primarily of sponsorships and sales of event tickets to Forrester events.

Forrester evaluates reportable segment performance and allocates resources based on direct margin. Direct margin, as presented below, is defined as operating income excluding sales expenses, certain marketing and fulfillment expenses, stock-based compensation expense, general and administrative expenses, depreciation expense, and amortization of intangibles. The accounting policies used by the reportable segments are the same as those used in the consolidated financial statements.

Forrester does not identify or allocate assets, including capital expenditures, by operating segment. Accordingly, assets are not being reported by segment because the information is not available by segment and is not reviewed in the evaluation of performance or in making decisions on the allocation of resources.

The following tables present information about reportable segments (in thousands):


	BT		TI		M&S		Events		Consolidated
Three months ended September 30, 2011
Revenue	$	25,220	$	21,655	$	21,499	$	1,400	$	69,774
Direct margin		17,065		15,231		13,387		410		46,093
Selling, marketing, administrative and other expenses										(35,665	)
Amortization of intangible assets										(679	)

Income from operations									$	9,749


	BT		TI		M&S		Events			Consolidated
Three months ended September 30, 2010
Revenue	$	23,047	$	18,342	$	17,889	$	499		$	59,777
Direct margin		16,283		13,410		11,059		(146	)		40,606
Selling, marketing, administrative and other expenses											(33,888	)
Amortization of intangible assets											(905	)

Income from operations										$	5,813


	BT		TI		M&S		Events		Consolidated
Nine months ended September 30, 2011
Revenue	$	73,667	$	62,373	$	62,828	$	10,098	$	208,966
Direct margin		49,319		44,381		38,615		4,601		136,916
Selling, marketing, administrative and other expenses										(111,455	)
Amortization of intangible assets										(1,898	)

Income from operations									$	23,563


	BT		TI		M&S		Events		Consolidated
Nine months ended September 30, 2010
Revenue	$	69,173	$	54,617	$	52,133	$	7,687	$	183,610
Direct margin		48,456		40,215		31,880		3,182		123,733
Selling, marketing, administrative and other expenses										(97,338	)
Amortization of intangible assets										(2,715	)

Income from operations									$	23,680

During the three months ended September 30, 2011, the Company identified errors in the presentation of direct margin by operating segment during the nine-month period ending September 30, 2010. Certain corporate level adjustments related to the BT, TI and M&S segments were incorrectly classified within the Event segment. There was no effect on consolidated segment direct margin. The Company has concluded that the error described above was immaterial to all periods discussed. The Company has detailed the adjustments to the prior periods below (amounts in thousands):


	BT			TI		M&S			Events			Consolidated
Direct margin — three months ended March 31, 2010
As reported	$	15,913		$	13,915	$	10,159		$	(120	)	$	39,867
As adjusted		15,981			13,318		10,199			369			39,867

Change	$	(68	)	$	597	$	(40	)	$	(489	)	$	—


Direct margin — three months ended June 30, 2010
As reported	$	16,166		$	14,388	$	10,616		$	2,090		$	43,260
As adjusted		16,192			13,487		10,622			2,959			43,260

Change	$	(26	)	$	901	$	(6	)	$	(869	)	$	—


Direct margin — six months ended June 30, 2010
As reported	$	32,079		$	28,303	$	20,775		$	1,970		$	83,127
As adjusted		32,173			26,805		20,821			3,328			83,127

Change	$	(94	)	$	1,498	$	(46	)	$	(1,358	)	$	—


Direct margin — three months ended September 30, 2010
As reported	$	15,990		$	13,616	$	11,059		$	(59	)	$	40,606
As adjusted		16,283			13,410		11,059			(146	)		40,606

Change	$	(293	)	$	206	$	—		$	87		$	—


Direct margin — nine months ended September 30, 2010
As reported	$	48,069		$	41,920	$	31,834		$	1,910		$	123,733
As adjusted		48,456			40,215		31,880			3,182			123,733

Change	$	(387	)	$	1,705	$	(46	)	$	(1,272	)	$	—

- Definition

The entire disclosure for reporting segments including data and tables. Reportable segments include those that meet any of the following quantitative thresholds a) it's reported revenue, including sales to external customers and intersegment sales or transfers is 10 percent or more of the combined revenue, internal and external, of all operating segments b) the absolute amount of its reported profit or loss is 10 percent or more of the greater, in absolute amount of 1) the combined reported profit of all operating segments that did not report a loss or 2) the combined reported loss of all operating segments that did report a loss c) its assets are 10 percent or more of the combined assets of all operating segments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 131
-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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+ Details