Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2015

Investments Debt And Equity Securities [Abstract]

Summary of Cash Equivalents and Available-for-Sale Securities

The table below summarizes the Company’s cash equivalents and available-for-sale securities (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gains		(Losses)			Fair Value
December 31, 2015
Cash equivalents:
Money market funds	$	25,070	$	—	$	—		$	25,070
Commercial paper securities		2,000		—		—			2,000
U.S. government sponsored entity debt securities		38,866		1		—			38,867
Total		65,936		1		—			65,937
Available-for-sale securities:
Commercial paper securities	$	30,667	$	50	$	—		$	30,717
Corporate debt securities		17,275		—		(12	)		17,263
U.S. government sponsored entity debt securities		91,562		—		(24	)		91,538
Total		139,504		50		(36	)		139,518
Total cash equivalents and available-for-sale securities	$	205,440	$	51	$	(36	)	$	205,455
December 31, 2014
Cash equivalents:
Money market funds	$	3,182	$	—	$	—		$	3,182
Total		3,182		—		—			3,182
Available-for-sale securities:
Commercial paper securities	$	33,715	$	33	$	—		$	33,748
Corporate debt securities		22,831		—		(18	)		22,813
U.S. government sponsored entity debt securities		163,671		—		(40	)		163,631
Total		220,217		33		(58	)		220,192
Total cash equivalents and available-for-sale securities	$	223,399	$	33	$	(58	)	$	223,374