Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

Fair Value Disclosures [Abstract]

Fair Value of Financial Assets and Liabilities Measured on Recurring Basis

The following table sets forth the fair value of our financial assets and liabilities, allocated into Level 1, Level 2 and Level 3, that was measured on a recurring basis (in thousands):

	September 30, 2014
	Level 1		Level 2			Level 3		Total
Financial Assets:
Money market funds	$	13,588	$	—		$	—	$	13,588
Corporate notes and commercial paper		—		164,006			—		164,006
U.S. government agency securities		—		60,996			—		60,996
Total financial assets	$	13,588		225,002		$	—		238,590
Financial Liabilities:
Foreign currency forward contracts	$	—	$	(68	)	$	—	$	(68	)
Total financial liabilities	$	—	$	(68	)	$	—	$	(68	)

	December 31, 2013
	Level 1		Level 2		Level 3		Total
Financial Assets:
Money market funds	$	57,296	$	—	$	—	$	57,296
Corporate notes and commercial paper		—		182,472		—		182,472
U.S. government agency securities		—		75,289		—		75,289
Foreign currency forward contracts		—		372		—		372
Total financial assets	$	57,296	$	258,133	$	—	$	315,429