Investments (Tables)

3 Months Ended

Mar. 31, 2019

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, 2019 and December 31, 2018 (in thousands):

	March 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	8,817	$	9	$	(17	)	$	8,809
U.S. Treasury securities	25,401		8		(22		)	25,387
U.S. Agency securities	6,521		—		(20		)	6,501
Commercial paper	8,463		—		—			8,463
Asset-backed securities	4,390		1		—			4,391
Corporate notes and bonds	22,008		4		(13		)	21,999
Total	$	75,600	$	22	$	(72	)	$	75,550

	December 31, 2018
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	10,787	$	—	$	—		$	10,787
U.S. Treasury securities	22,185		1		(66		)	22,120
U.S. Agency securities	8,024		1		(45		)	7,980
Commercial paper	17,025		—		—			17,025
Asset-backed securities	12,007		—		(9		)	11,998
Corporate notes and bonds	30,361		—		(53		)	30,308
Total	$	100,389	$	2	$	(173	)	$	100,218

Schedule of Available-For-Sale Investment Maturities

The following table summarizes the maturities of the Company’s available-for-sale securities at March 31, 2019 and December 31, 2018 (in thousands):

	March 31, 2019				December 31, 2018
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than 1 year	$	68,462	$	68,394	$	83,030	$	82,893
Due in 1-3 years	7,138		7,156		17,359		17,325
Total	$	75,600	$	75,550	$	100,389	$	100,218