Fair Value Measurements of Assets and Liabilities (Tables)

12 Months Ended

Dec. 31, 2015

Fair Value Disclosures [Abstract]

Financial Assets Measured at Fair Value on Recurring Basis

The following table presents our financial assets that were measured at fair value on a recurring basis (in thousands):

	December 31, 2015
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents
Money market mutual funds	$	246	$	—	$	—	$	246
Marketable securities
Commercial paper	—		7,485		—		7,485
Corporate notes and bonds	—		48,859		—		48,859
Government obligations	—		13,991		—		13,991
U.S. government and agency	—		32,504		—		32,504
	—		102,839		—		102,839
Total	$	246	$	102,839	$	—	$	103,085
	December 31, 2014
	Level 1		Level 2		Level 3		Total
Assets:
Cash equivalents
Money market mutual funds	$	1,609	$	—	$	—	$	1,609
Marketable securities
Commercial paper	—		2,499		—		2,499
Corporate notes and bonds	—		57,105		—		57,105
Government obligations	—		1,996		—		1,996
U.S. government and agency	—		38,943		—		38,943
	—		100,543		—		100,543
Total	$	1,609	$	100,543	$	—	$	102,152