Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Schedule of Available-for-Sale Investments

The following tables summarize the Company’s available-for-sale investments at March 31, 2018 and December 31, 2017 (in thousands):

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	13,936	$	—	$	—		$	13,936
U.S. Treasury securities	18,963		—		(100		)	18,863
U.S. Agency securities	7,006		—		(65		)	6,941
Commercial paper	2,791		—		—			2,791
Asset-backed securities	—		—		—			—
Corporate notes and bonds	24,305		—		(82		)	24,223
Total	$	67,001	$	—	$	(247	)	$	66,754

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	13,441	$	—	$	—		$	13,441
U.S. Treasury securities	14,787		—		(71		)	14,716
U.S. Agency securities	8,510		—		(51		)	8,459
Commercial paper	9,171		—		—			9,171
Asset-backed securities	3,026		—		(1		)	3,025
Corporate notes and bonds	31,906		—		(70		)	31,836
Total	$	80,841	$	—	$	(193	)	$	80,648

Schedule of Available-For-Sale Investment Maturities

The following table summarizes the maturities of the Company’s available-for-sale securities at March 31, 2018 and December 31, 2017 (in thousands):

	March 31, 2018				December 31, 2017
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than 1 year	$	40,973	$	40,864	$	55,801	$	55,735
Due in 1-5 years	26,028		25,890		25,040		24,913
Total	$	67,001	$	66,754	$	80,841	$	80,648