Investments (Tables)

6 Months Ended

Jun. 30, 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 June 30, 2019 and December 31, 2018 (in thousands):

	June 30, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Certificates of deposit	$	6,869	$	17	$	(5	)	$	6,881
U.S. Treasury securities	20,982		31		(2		)	21,011
U.S. Agency securities	4,013		—		(5		)	4,008
Commercial paper	6,080		—		—			6,080
Corporate notes and bonds	12,356		14		(1		)	12,369
Total	$	50,300	$	62	$	(13	)	$	50,349

	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 June 30, 2019 and December 31, 2018 (in thousands):

	June 30, 2019				December 31, 2018
	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Due in less than 1 year	$	47,839	$	47,870	$	83,030	$	82,893
Due in 1-3 years	2,461		2,479		17,359		17,325
	$	50,300	$	50,349	$	100,389	$	100,218