Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2014

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 September 30, 2014	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	17,667	$	—	$	—	$	17,667
Short-term investments:
U.S. government-related debt securities		—		1,519		—		1,519
Corporate debt securities		—		43,857		—		43,857
Asset-backed securities		—		3,298		—		3,298
Total	$	17,667	$	48,674	$	—	$	66,341
As of December 31, 2013	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	8,454	$	—	$	—	$	8,454
Short-term investments:
U.S. government-related debt securities		—		1,566		—		1,566
Corporate debt securities		—		31,149		—		31,149
Total	$	8,454	$	32,715	$	—	$	41,169