Fair Value Measurements (Tables)

9 Months Ended

Sep. 30, 2013

Fair Value Disclosures [Abstract]

Schedule of 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):

	Fair value measurement using:
As of September 30, 2013	Quoted prices in active markets for identical assets (Level 1)		Other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
Cash equivalents:
Money market fund	$	18,734	$	—	$	—	$	18,734
Short-term investments:
U.S. government-related debt securities		—		1,583		—		1,583
Corporate debt securities		—		31,339		—		31,339
Total	$	18,734	$	32,922	$	—	$	51,656
	Fair value measurement using:
As of December 31, 2012	Quoted prices in active markets for identical assets (Level 1)		Other observable inputs (Level 2)		Significant unobservable inputs (Level 3)		Total
Cash equivalents:
Money market fund	$	20,510	$	—	$	—	$	20,510
Total	$	20,510	$	—	$	—	$	20,510