Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2015

Fair Value Disclosures [Abstract]

Fair Value Measurements of Company's Financial Assets and Liabilities

The Company’s financial assets and liabilities subject to fair value measurements on a recurring basis and the level of inputs used in such measurements are as follows as of March 31, 2015 and December 31, 2014 (in thousands):

	March 31, 2015
Description	Level 1		Level 2		Level 3		Total
Money market fund	$	24,296	$	—	$	—	$	24,296
U.S. treasury securities		—		19,149		—		19,149
Government-sponsored agencies		—		25,246		—		25,246
Corporate debt securities		—		34,938		—		34,938
Total assets	$	24,296	$	79,333	$	—	$	103,629
	December 31, 2014
Description	Level 1		Level 2		Level 3		Total
Money market fund	$	15,922	$	—	$	—	$	15,922
U.S. treasury securities		—		19,120		—		19,120
Government-sponsored agencies		—		29,763		—		29,763
Commercial paper		—		1,500		—		1,500
Corporate debt securities		—		48,162		—		48,162
Total assets	$	15,922	$	98,545	$	—	$	114,467