Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2015

Fair Value Disclosures [Abstract]

Company's Available-for-Sale Securities by Level within Fair Value Hierarchy

The Company’s available-for-sale securities by level within the fair value hierarchy were as follows (in thousands):

As of June 30, 2015	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	13,318	$	—	$	—	$	13,318
Short-term investments:
Corporate debt securities		—		35,390		—		35,390
Asset-backed securities		—		1,394		—		1,394
Total	$	13,318	$	36,784	$	—	$	50,102
As of December 31, 2014	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	13,426	$	—	$	—	$	13,426
Short-term investments:
U.S. government-related debt securities		—		4,498		—		4,498
Corporate debt securities		—		47,307		—		47,307
Asset-backed securities		—		3,197		—		3,197
Total	$	13,426	$	55,002	$	—	$	68,428