Investments and Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2022

Investments and Fair Value Measurements

Schedule of available-for-sale securities

		March 31, 2022
				Gross		Gross
		Amortized		Unrealized		Unrealized		Estimated
(In thousands)		Cost		Gains		Losses		Fair Value
US government securities	Level 1	$	44,982	$	—	$	(27)	$	44,955
Corporate notes	Level 2		5,004		—		(2)		5,002
Commercial paper	Level 2		18,194		—		(5)		18,189
Marketable securities			68,180		—		(34)		68,146
Money market funds	Level 1		38,250		—		—		38,250
Total		$	106,430	$	—	$	(34)	$	106,396

		December 31, 2021
				Gross		Gross
		Amortized		Unrealized		Unrealized		Estimated
(In thousands)		Cost		Gains		Losses		Fair Value
US government securities	Level 1	$	29,986	$	—	$	(2)	$	29,984
Corporate notes	Level 2		5,034		—		(2)		5,032
Commercial paper	Level 2		48,490		1		(1)		48,490
Marketable securities			83,510		1		(5)		83,506
Money market funds	Level 1		50,228		—		—		50,228
Total		$	133,738	$	1	$	(5)	$	133,734

Schedule of Available for sale debt securities with unrealized losses

Available-for-sale debt securities with unrealized losses are summarized below:

	March 31, 2022
	Less than 12 Months				Greater than 12 Months				Total
			Gross				Gross				Gross
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
US government securities	$	39,956	$	(27)	$	—	$	—	$	39,956	$	(27)
Corporate notes		5,002		(2)		—		—		5,002		(2)
Commercial paper		18,189		(5)		—		—		18,189		(5)
Total	$	63,147	$	(34)	$	—	$	—	$	63,147	$	(34)

	December 31, 2021
	Less than 12 Months				Greater than 12 Months				Total
			Gross				Gross				Gross
	Estimated		Unrealized		Estimated		Unrealized		Estimated		Unrealized
(In thousands)	Fair Value		Losses		Fair Value		Losses		Fair Value		Losses
US government securities	$	19,991	$	(2)	$	—	$	—	$	19,991	$	(2)
Corporate notes		5,031		(2)		—		—		5,031		(2)
Commercial paper		9,995		(1)		—		—		9,995		(1)
Total	$	35,017	$	(5)	$	—	$	—	$	35,017	$	(5)