Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2016

Fair Value Disclosures [Abstract]

Summary of Fair Value Measurements of Cash Equivalents, and Available-for-Sale Marketable Securities

The fair value measurements of the Company’s cash equivalents, and available-for-sale marketable securities are identified at the following levels within the fair value hierarchy (in thousands):

	March 31, 2016
	Fair Value Measurements
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents:
Money market funds	$	19,387	$	19,387	$	—	$	—
U.S. government sponsored entity debt securities		8,670		8,670		—		—
Total		28,057		28,057		—		—
Marketable securities:
Commercial paper securities		32,468		—		32,468		—
Corporate debt securities		14,559		—		14,559		—
U.S. government sponsored entity debt securities		108,548		—		108,548		—
Total		155,575		—		155,575		—
Total cash equivalents and marketable securities	$	183,632	$	28,057	$	155,575	$	—

	December 31, 2015
	Fair Value Measurements
	Total		Level 1		Level 2		Level 3
Assets:
Cash equivalents:
Money market funds	$	25,070	$	25,070	$	—	$	—
Commercial paper securities		2,000		2,000		—		—
U.S. government sponsored entity debt securities		38,867		38,867		—		—
Total		65,937		65,937		—		—
Marketable securities:
Commercial paper securities		30,717		—		30,717		—
Corporate debt securities		17,263		—		17,263		—
U.S. government sponsored entity debt securities		91,538		—		91,538		—
Total		139,518		—		139,518		—
Total cash equivalents and marketable securities	$	205,455	$	65,937	$	139,518	$	—