Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2019

Investments, Debt and Equity Securities [Abstract]

Schedule of Marketable Securities

The table below summarizes the marketable securities:

	December 31, 2019
	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Money market funds	$	3,068	$	—	$	—		$	3,068
Commercial paper	2,495		—		—			2,495
Cash equivalents	5,563		—		—			5,563
U.S. treasury securities	67,051		34		(2		)	67,083
Corporate bonds	9,075		24		(2		)	9,097
Commercial paper	5,165		—		—			5,165
Short-term investments	81,291		58		(4		)	81,345
Corporate bonds	1,278		—		—			1,278
Long-term investments	1,278		—		—			1,278
Total marketable securities	$	88,132	$	58	$	(4	)	$	88,186

The long-term investments outstanding as of December 31, 2019 mature in April 2021.

	December 31, 2018
	Amortized Cost		Unrealized Gains		Unrealized Losses			Aggregate Fair Value
	(in thousands)
Money market funds	$	15,223	$	—	$	—		$	15,223
U.S. treasury securities	1,000		—		—			1,000
Commercial paper	6,635		—		—			6,635
Cash equivalents	22,858		—		—			22,858
U.S. treasury securities	65,491		2		(4		)	65,489
Corporate bonds	19,708		15		(3		)	19,720
Commercial paper	11,894		—		—			11,894
Short-term investments	97,093		17		(7		)	97,103
Total marketable securities	$	119,951	$	17	$	(7	)	$	119,961