Investments (Tables)

12 Months Ended

Dec. 31, 2023

Investments

Schedule of amortized cost and fair value of available-for-sale securities

			Gross		Gross
	Amortized		Unrealized		Unrealized		Estimated
	Cost		Gains		Losses		Fair Value
	(in thousands)
December 31, 2023
U.S. treasuries	$	59,541	$	3	$	(51)	$	59,493
Government agency securities		41,843		6		(31)		41,818
Corporate debt		35,447		9		(47)		35,409
Commercial paper		9,944		—		—		9,944
Total	$	146,775	$	18	$	(129)	$	146,664
December 31, 2022
U.S. treasuries	$	63,331	$	—	$	(482)	$	62,849
Government agency securities		27,464		—		(98)		27,366
Corporate debt		42,006		—		(415)		41,591
Commercial paper		15,682		—		—		15,682
Total	$	148,483	$	—	$	(995)	$	147,488

Schedule of fair value and unrealized losses of available-for-sale securities in a loss position

	Continuous Loss Position				Continuous Loss Position
	for Less than 12 Months				for 12 Months or More
			Gross				Gross
	Estimated		Unrealized		Estimated		Unrealized
	Fair Value		Losses		Fair Value		Losses
		(in thousands)
December 31, 2023
U.S. treasuries	$	43,118	$	(50)	$	—	$	—
Government agency securities		34,885		(31)		—		—
Corporate debt		23,262		(33)		2,618		(15)
Total	$	101,265	$	(114)	$	2,618	$	(15)
December 31, 2022
U.S. treasuries	$	39,791	$	(84)	$	23,057	$	(398)
Government agency securities		22,528		(86)		4,838		(12)
Corporate debt		19,693		(138)		21,898		(277)
Total	$	82,012	$	(308)	$	49,793	$	(687)

Schedule of contractual maturities of securities classified as available-for-sale

	December 31, 2023
	Amortized		Estimated
	Cost		Fair Value
		(in thousands)
Due in one year or less	$	132,419	$	132,330
Due after one year through two years		14,356		14,334
Total	$	146,775	$	146,664