Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Valuation of Company's Assets and Liabilities Measured at Fair Value

The following table summarizes the valuation of the Company’s assets and liabilities measured at fair value as categorized based on the hierarchy described in Note 2.

	Level 1		Level 2		Level 3		Total
As of December 31, 2015	(In thousands)
Money market funds	$	61,913	$	—	$	—	$	61,913
Securities available-for-sale
Corporate bonds		—		82,671		—		82,671
Municipal securities		—		2,035		—		2,035
Foreign currency forward position		—		354		—		354
Total	$	61,913	$	85,060	$	—	$	146,973
As of December 31, 2014
Money market funds	$	62,126	$	—	$	—	$	62,126
Securities available-for-sale
Corporate bonds		—		53,167		—		53,167
Municipal securities		—		11,696		—		11,696
Foreign currency forward position		—		103		—		103
Total	$	62,126	$	64,966	$	—	$	127,092

Summary of Foreign Currency Forward Contracts

A summary of the foreign currency forward position is as follows:

	As of December 31,
		2015		2014
	(In thousands)
Notional value	$	45,716	$	32,089
Fair value of notional		45,362		31,986
Fair value of the asset	$	354	$	103

Summary of Company's Securities Available-for-Sale

The following is a summary of the Company’s securities available-for-sale:

			Gross		Gross			Estimated
	Amortized		unrealized		unrealized			fair
	cost		gains		losses			value
	(In thousands)
As of December 31, 2015
Corporate bonds	$	82,937	$	4	$	(270	)	$	82,671
Municipal securities		2,035		—		—			2,035
Total securities available-for-sale	$	84,972	$	4	$	(270	)	$	84,706
As of December 31, 2014
Corporate bonds	$	53,146	$	50	$	(29	)	$	53,167
Municipal securities		11,693		5		(2	)		11,696
Total securities available-for-sale	$	64,839	$	55	$	(31	)	$	64,863

Summary of Contractual Maturities of Securities Available-for-Sale

The following table summarizes the contractual maturities of securities available-for-sale:

	As of December 31,
		2015		2014
	(In thousands)
Less than one year	$	37,694	$	36,062
Due in 1 - 5 years		47,012		28,801
Total securities available-for-sale	$	84,706	$	64,863

Fair Values and Unrealized Losses on Securities Available-for-Sale

The following table provides fair values and unrealized losses on securities available-for-sale that have been in a continuous unrealized loss position for less than 12 months:

	Less than Twelve Months					Twelve Months or More				Total
	Estimated		Gross			Estimated		Gross		Estimated		Gross
	fair		unrealized			fair		unrealized		fair		unrealized
	value		losses			value		losses		value		losses
	(In thousands)
As of December 31, 2015
Corporate bonds	$	70,651	$	(270	)	$	—	$	—	$	70,651	$	(270	)
Total	$	70,651	$	(270	)	$	—	$	—	$	70,651	$	(270	)
As of December 31, 2014
Corporate bonds	$	20,487	$	(29	)	$	—	$	—	$	20,487	$	(29	)
Municipal securities		2,139		(2	)		—		—		2,139		(2	)
Total	$	22,626	$	(31	)	$	—	$	—	$	22,626	$	(31	)