Investments and Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2023

Investments and Fair Value Measurements

Schedule of available-for-sale securities

		December 31, 2023
				Gross		Gross
		Amortized		Unrealized		Unrealized		Estimated
(In thousands)		Cost		Gains		Losses		Fair Value
US government securities	Level 1	$	29,848	$	—	$	(29)	$	29,819
US government agency securities	Level 2		4,428		—		(8)		4,420
Corporate notes	Level 2		28,670		4		(32)		28,642
Marketable securities			62,946		4		(69)		62,881
Money market funds	Level 1		26,179		—		—		26,179
Total		$	89,125	$	4	$	(69)	$	89,060

		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

	December 31, 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	$	29,819	$	(29)	$	—	$	—	$	29,819	$	(29)
US government agency securities		4,420		(8)		—		—		4,420		(8)
Corporate notes		23,641		(32)		—		—		23,641		(32)
Total	$	57,880	$	(69)	$	—	$	—	$	57,880	$	(69)

	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)