Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2013
Money market funds	$	89,819	$	—	$	—	$	89,819
Securities available-for-sale:
Municipal securities		—		12,353		—		12,353
Corporate bonds		—		2,126		—		2,126
Foreign currency forward position		—		227		—		227
	$	89,819	$	14,706	$	—	$	104,525
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 Contract

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

	As of
	June 30, 2013		December 31, 2012
	(In thousands)
Notional value	$	27,335	$	15,792
Fair value of notional		27,108		15,809
Gross and net fair value asset and (liability)	$	227	$	(17	)

Summary of Company's Securities Available-for-Sale

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

	Amortized cost		Gross unrealized gains		Gross unrealized losses			Estimated fair value
	(In thousands)
As of June 30, 2013
Municipal securities	$	12,342	$	11	$	—		$	12,353
Corporate bonds		2,122		4		—			2,126
Total securities available-for-sale	$	14,464	$	15	$	—		$	14,479
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
	June 30, 2013		December 31, 2012
	(In thousands)
Less than one year	$	8,909	$	10,870
Due in 1—5 years		5,570		40,338
Total securities available-for-sale	$	14,479	$	51,208

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

2013. 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 as of December 31, 2012:

	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, 2012
Municipal securities	$	2,780	$	(4	)	$	—	$	—	$	2,780	$	(4	)
Corporate bonds		2,157		(2	)		—		—		2,157		(2	)
Total securities available-for-sale	$	4,937	$	(6	)	$	—	$	—	$	4,937	$	(6	)