Marketable Securities (Tables)

9 Months Ended

Sep. 30, 2020

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities

Marketable securities consisted of the following (in thousands):

	As of December 31, 2019
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. treasury securities	$	13,602	$	1	$	—	$	13,603
U.S. agency obligations	6,400		1		—		6,401
Money market mutual funds	8,736		—		—		8,736
	28,738		2		—		28,740
Included in cash and cash equivalents	12,329		—		—		12,329
Included in marketable securities	$	16,409	$	2	$	—	$	16,411