Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2016

Investments Debt And Equity Securities [Abstract]

Schedule of Investments

The table below summarizes the Company’s investments (in thousands):

			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gains		(Losses)			Fair Value
March 31, 2016
Cash equivalents:
Money market funds	$	19,387	$	—	$	—		$	19,387
U.S. government sponsored entity debt securities		8,669		1		—			8,670
Total		28,056		1		—			28,057
Available-for-sale securities:
Commercial paper securities	$	32,413	$	55	$	—		$	32,468
Corporate debt securities		14,563		1		(5	)		14,559
U.S. government sponsored entity debt securities		108,501		50		(3	)		108,548
Total		155,477		106		(8	)		155,575
Total cash equivalents and available-for-sale securities	$	183,533	$	107	$	(8	)	$	183,632
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