Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2015

Components of Accumulated Other Comprehensive Income (Loss)

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

							Total
	Net Unrealized Gain			Cumulative			Accumulated
	(Loss) on Marketable			Translation			Other Comprehensive
	Investments			Adjustment			Income (Loss)
Balance at December 31, 2012	$	(1,024	)	$	1,612		$	588
Foreign currency translation		—			826			826
Unrealized loss on investments before reclassification, net of tax of $41		(111	)		—			(111	)
Reclassification adjustment for net losses realized in net income, net of tax of $691		1,151			—			1,151
Balance at December 31, 2013		16			2,438			2,454
Foreign currency translation		—			(3,977	)		(3,977	)
Unrealized loss on investments before reclassification, net of tax of $47		(84	)		—			(84	)
Reclassification adjustment for net gains realized in net income, net of tax of $8		(6	)		—			(6	)
Balance at December 31, 2014		(74	)		(1,539	)		(1,613	)
Foreign currency translation before reclassification		—			(3,505	)		(3,505	)
Reclassification adjustment for write-off of foreign currency translation loss		—			318			318
Unrealized loss on investments, net of tax of $20		(26	)		—			(26	)
Balance at December 31, 2015	$	(100	)	$	(4,726	)	$	(4,826	)

Summary of Stock-Based Compensation Expense Recorded in Expense Categories

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

	Years Ended December 31,
	2015		2014		2013
Cost of services and fulfillment	$	4,573	$	4,316	$	3,585
Selling and marketing		1,152		1,132		1,136
General and administrative		2,622		1,996		1,330
Total	$	8,347	$	7,444	$	6,051

Options Granted Under Equity Incentive Plans and Shares Subject to Employee Stock Purchase Plan Valuation Assumptions

The options granted under the equity incentive plan and shares subject to the employee stock purchase plan were valued utilizing the Black Scholes model using the following assumptions and had the following fair values:

	Years Ended December 31,
	2015						2014						2013
	Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan			Equity Incentive Plans			Employee Stock Purchase Plan
Average risk-free interest rate		1.59	%		0.07	%		1.69	%		0.06	%		0.85	%		0.12	%
Expected dividend yield		2.1	%		1.9	%		1.8	%		2.0	%		2.1	%		1.9	%
Expected life	5.0 Years			0.5 Years			5.1 Years			0.5 Years			4.9 Years			0.5 Years
Expected volatility		24	%		22	%		26	%		24	%		36	%		22	%
Weighted average fair value	$	6.15		$	7.19		$	7.91		$	7.32		$	9.21		$	6.02

Depreciation and Amortization of Property and Equipment, Useful Life

Forrester provides for depreciation and amortization of property and equipment, computed using the straight-line method, over estimated useful lives of assets as follows:

		Estimated
		Useful Life
Computers and equipment		3 to 10 Years
Computer software		3 to 5 Years
Furniture and fixtures		7 Years
Leasehold improvements		Shorter of asset life or lease term

Amortization of Intangible Assets, Useful Life

Forrester provides for amortization of intangible assets, computed using an accelerated method according to the expected cash flows to be received from the underlying assets, over the respective lives as follows:

		Estimated
		Useful Life
Customer relationships		5 to 11 Years
Research content		1 to 2 Years
Technology		7 Years
Trademarks		1 Year

Summary of Basic and Diluted Weighted Average Common Shares

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

	Years Ended December 31,
	2015		2014		2013
Basic weighted average common shares outstanding		17,927		18,713		20,861
Weighted average common equivalent shares		216		294		492
Diluted weighted average common shares outstanding		18,143		19,007		21,353
Options excluded from diluted weighted average share calculation as effect would have been anti-dilutive		1,237		587		658