Investments and Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2023

Investments and Fair Value Measurements

Schedule of available-for-sale securities

		June 30, 2023
				Gross		Gross
		Amortized		Unrealized		Unrealized		Estimated
(In thousands)		Cost		Gains		Losses		Fair Value
US government securities	Level 1	$	29,361	$	—	$	(139)	$	29,222
US government agency securities	Level 2		4,341		—		(26)		4,315
Corporate notes	Level 2		28,439		—		(121)		28,318
Marketable securities			62,141		—		(286)		61,855
Money market funds	Level 1		96,321		—		—		96,321
Total		$	158,462	$	—	$	(286)	$	158,176

		December 31, 2022
				Gross		Gross
		Amortized		Unrealized		Unrealized		Estimated
(In thousands)		Cost		Gains		Losses		Fair Value
US government securities	Level 1	$	24,873	$	8	$	—	$	24,881
US government agency securities	Level 2		20,869		4		—		20,873
Commercial paper	Level 2		37,307		—		(27)		37,280
Marketable securities			83,049		12		(27)		83,034
Money market funds	Level 1		220,508		—		—		220,508
Total		$	303,557	$	12	$	(27)	$	303,542

Schedule of Available for sale debt securities with unrealized losses

	June 30, 2023
	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	$	29,222	$	(138)	$	—	$	—	$	29,222	$	(138)
US government agency securities		4,315		(26)		—		—		4,315		(26)
Corporate notes		28,318		(121)		—		—		28,318		(121)
Total	$	61,855	$	(286)	$	—	$	—	$	61,855	$	(286)

	December 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
Commercial paper	$	37,280	$	(27)	$	—	$	—	$	37,280	$	(27)
Total	$	37,280	$	(27)	$	—	$	—	$	37,280	$	(27)