Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2014	Level 1		Level 2		Level 3		Total
Cash equivalents:
Money market fund	$	28,567	$	—	$	—	$	28,567
Short-term investments:
U.S. government-related debt securities		—		1,551		—		1,551
Corporate debt securities		—		55,286		—		55,286
Total	$	28,567	$	56,837	$	—	$	85,404
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