Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

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
	(In thousands)
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 position		—		(472	)		—		(472	)
	$	90,536	$	67,270		$	—	$	157,806
As of December 31, 2012
Money market funds	$	83,519	$	—		$	—	$	83,519
Securities available-for-sale
U.S. government obligations		—		31,104			—		31,104
Municipal securities		—		17,947			—		17,947
Corporate bonds		—		2,157			—		2,157
Foreign currency forward and option contracts		—		15			—		15
	$	83,519	$	51,223		$	—	$	134,742

Summary of Foreign Currency Forward Contracts

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

	As of December 31,
	2013			2012
	(In thousands)
Notional value	$	29,431		$	15,792
Fair value of notional		29,903			15,809
Fair value of the liability	$	(472	)	$	(17	)

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, 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
As of December 31, 2012
U.S. government obligations	$	30,255	$	849	$	—		$	31,104
Municipal securities		17,941		10		(4	)		17,947
Corporate bonds		2,159		—		(2	)		2,157
Total securities available-for-sale	$	50,355	$	859	$	(6	)	$	51,208

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,
	2013		2012
	(In thousands)
Less than one year	$	12,332	$	10,870
Due in 1—5 years		55,410		40,338
Total securities available-for-sale	$	67,742	$	51,208

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 by 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, 2013
Municipal securities	$	4,955	$	(6	)	$	—	$	—	$	4,955	$	(6	)
Corporate bonds		10,728		(13	)		—		—		10,728		(13	)
Total	$	15,683	$	(19	)	$	—	$	—	$	15,683	$	(19	)
As of December 31, 2012
U.S. government obligations	$	—	$	—		$	—	$	—	$	—	$	—
Municipal securities		2,780		(4	)		—		—		2,780		(4	)
Corporate bonds		2,157		(2	)		—		—		2,157		(2	)
Total	$	4,937	$	(6	)	$	—	$	—	$	4,937	$	(6	)