Marketable Securities

12 Months Ended

Dec. 31, 2021

Investments Debt And Equity Securities [Abstract]

Marketable Securities

4. Marketable Securities

The Company’s marketable securities, which consist of highly liquid marketable debt securities, are classified as available-for-sale and are stated at fair value. The following tables summarize the Company’s marketable securities (in thousands):

As of December 31, 2021	Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
U.S. Treasury securities	1 or less	$	2,492	$	—	$	(1	)	$	2,491
Negotiable certificates of deposit	1 or less		1,190		—		(1	)		1,189
U.S. Treasury securities	1 - 2		63,034		—		(153	)		62,881
Negotiable certificates of deposit	1 - 2		2,687		—		(3	)		2,684
Corporate debt securities	1 - 2		15,879		—		(29	)		15,850
Total		$	85,282	$	—	$	(187	)	$	85,095

As of December 31, 2020	Maturity (in years)	Amortized Cost		Unrealized Gains		Unrealized Losses			Estimated Fair Value
Corporate debt securities	1 or less	$	3,612	$	—	$	(2	)	$	3,610
Corporate debt securities	1 - 2		3,072		—		(3	)		3,069
Total		$	6,684	$	—	$	(5	)	$	6,679