Marketable Securities (Tables)

6 Months Ended

Jun. 30, 2020

Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]

Summary of Marketable Securities

Marketable securities consisted of the following as of June 30, 2020 and December 31, 2019 (in thousands):

	June 30, 2020 (unaudited)
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available-for-sale securities - short-term:
U.S. treasury securities	$	5,033	$	4	$	—	$	5,037
Total available-for-sale securities	$	5,033	$	4	$	—	$	5,037

	December 31, 2019
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Available-for-sale securities - short-term:
Corporate debt securities	$	28,204	$	20	$	—	$	28,224
Asset-backed securities		17,108		13		—		17,121
U.S. treasury securities		5,020		12		—		5,032
Commercial paper		11,974		—		—		11,974
Total available-for-sale securities	$	62,306	$	45	$	—	$	62,351