Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2014

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, 2014	(In thousands)
Money market funds	$	62,126	$	—		$	—	$	62,126
Securities available-for-sale
Municipal securities		—		11,696			—		11,696
Corporate bonds		—		53,167			—		53,167
Foreign currency forward position		—		103			—		103
	$	62,126	$	64,966		$	—	$	127,092
As of December 31, 2013
Money market funds	$	90,536	$	—		$	—	$	90,536
Securities available-for-sale
Municipal securities		—		16,052			—		16,052
Corporate bonds		—		51,690			—		51,690
Foreign currency forward and option contracts		—		(472	)		—		(472	)
	$	90,536	$	67,270		$	—	$	157,806

Summary of Foreign Currency Forward Contracts

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

	As of December 31,
		2014		2013
	(In thousands)
Notional value	$	32,089	$	29,431
Fair value of notional		31,986		29,903
Fair value of the asset (liability)	$	103	$	(472	)

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, 2014
Municipal securities	$	11,693	$	5	$	(2	)	$	11,696
Corporate bonds		53,146		50		(29	)		53,167
Total securities available-for-sale	$	64,839	$	55	$	(31	)	$	64,863
As of December 31, 2013
Municipal securities		16,049		9		(6	)		16,052
Corporate bonds		51,579		124		(13	)		51,690
Total securities available-for-sale	$	67,628	$	133	$	(19	)	$	67,742

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,
		2014		2013
	(In thousands)
Less than one year	$	36,062	$	12,332
Due in 1 - 5 years		28,801		55,410
Total securities available-for-sale	$	64,863	$	67,742

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

The following table provides fair values and unrealized losses on securities available-for-sale and the aging of the securities’ continuous unrealized loss position:

	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, 2014
Municipal securities	$	2,139	$	(2	)	$	—	$	—	$	2,139	$	(2	)
Corporate bonds		20,487		(29	)		—		—		20,487		(29	)
Total	$	22,626	$	(31	)	$	—	$	—	$	22,626	$	(31	)
As of December 31, 2013
Municipal securities	$	4,955		(6	)		—		—		4,955		(6	)
Corporate bonds		10,728		(13	)		—		—		10,728		(13	)
Total	$	15,683	$	(19	)	$	—	$	—	$	15,683	$	(19	)