Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2020

Investments, Debt and Equity Securities [Abstract]

Available-for-sale Securities

Marketable securities consisted of the following (in thousands):

	As of March 31, 2020
	Amortized Cost		Unrealized Gains		Unrealized Losses		Fair Value
U.S. treasury securities	$	2,002	$	3	$	—	$	2,005
U.S. agency obligations	11,644		10		—		11,654
Money market mutual funds	12,337		—		—		12,337
	25,983		13		—		25,996
Included in cash and cash equivalents	19,983		4		—		19,987
Included in marketable securities	$	6,000	$	9	$	—	$	6,009

	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