Investments

12 Months Ended

Dec. 31, 2022

Investments, Debt and Equity Securities [Abstract]

Investments

4. Investments

As of December 31, 2022 and 2021, the fair value of available-for-sale investments by type of security was as follows:

	December 31, 2022
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Investments:
Commercial paper	$	12,846	$	—	$	(32	)	$	12,814
Treasury bills		3,250		—		(16	)		3,234
	$	16,096	$	—	$	(48	)	$	16,048

	December 31, 2021
	Amortized Cost		Gross Unrealized Gain		Gross Unrealized Loss			Fair Value
Investments:
Commercial paper	$	33,976	$	—	$	(7	)	$	33,969
Corporate notes		6,368		—		(2	)		6,366
Treasury bills		2,002		—		(4	)		1,998
	$	42,346	$	—	$	(13	)	$	42,333