Short-term Investments (Tables)

3 Months Ended

Mar. 31, 2022

Short Term Investments [Abstract]

Summary of Short-term Investments

The following is a summary of our short-term investments (in thousands):

	March 31, 2022
			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
U.S. treasury bills and government agency obligations	$	30,016	$	—	$	(7	)	$	30,009
U.S. corporate debt securities		3,502		—		(2	)		3,500
Foreign commercial paper		21,490		—		—			21,490
Total	$	55,008	$	—	$	(9	)	$	54,999

	December 31, 2021
			Gross		Gross
	Amortized		Unrealized		Unrealized			Estimated
	Cost		Gains		Losses			Fair Value
U.S. corporate debt securities	$	15,009	$	—	$	(3	)	$	15,006
Foreign corporate debt securities		10,551		—		(3	)		10,548
U.S. commercial paper		5,998		—		—			5,998
Foreign commercial paper		35,487		—		—			35,487
Total	$	67,045	$	—	$	(6	)	$	67,039