Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value on Recurring Basis

The following table presents our fair value hierarchy for assets measured at fair value on a recurring basis as of March 31, 2016 and December 31, 2015 (in thousands):

	Fair value as of March 31, 2016
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	17,482	$	17,482	$	—	$	—
Corporate debt securities	70,365		—		70,365		—
Certificates of deposit	11,240		—		11,240		—
Commercial paper	4,244		—		4,244		—
	$	103,331	$	17,482	$	85,849	$	—

	Fair value as of December 31, 2015
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents	$	15,152	$	15,152	$	—	$	—
Corporate debt securities	80,967		—		80,967		—
Certificates of deposit	13,640		—		13,640		—
Commercial paper	3,496		—		3,496		—
	$	113,255	$	15,152	$	98,103	$	—