Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Schedule of Fair Value Assets Measured on Recurring Basis

The following table presents the balances of assets measured at fair value on a recurring basis as of June 30, 2015 and December 31, 2014:

	June 30, 2015						December 31, 2014
	Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
	(in thousands)
Money market funds	$	—	$	500	$	—	$	—	$	1,386	$	—
Commercial paper		—		37,373		—		—		38,055		—
Corporate bonds		—		76,927		—		—		75,080		—
Total	$	—	$	114,800	$	—	$	—	$	114,521	$	—