Investments - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Total available-for-sale securities
Amortized Cost	$ 146,775	$ 148,483
Gross Unrealized Gains	18
Gross Unrealized Losses	(129)	(995)
Estimated Fair Value	146,664	147,488
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	101,265	82,012
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(114)	(308)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	2,618	49,793
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(15)	(687)
Contractual maturities - Amortized Cost
Amortized Cost, Due in one year or less	132,419
Amortized Cost, Due after one year through two years	14,356
Amortized Cost	146,775	148,483
Contractual maturities - Estimated Fair Value
Estimated Fair Value, Due in one year or less	132,330
Estimated Fair Value, Due after one year through two years	14,334
Available-for-sale Securities, Debt Securities, Total	146,664	147,488
U.S. treasuries
Total available-for-sale securities
Amortized Cost	59,541	63,331
Gross Unrealized Gains	3
Gross Unrealized Losses	(51)	(482)
Estimated Fair Value	59,493	62,849
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	43,118	39,791
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(50)	(84)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value		23,057
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses		(398)
Contractual maturities - Amortized Cost
Amortized Cost	59,541	63,331
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	59,493	62,849
Government agency securities
Total available-for-sale securities
Amortized Cost	41,843	27,464
Gross Unrealized Gains	6
Gross Unrealized Losses	(31)	(98)
Estimated Fair Value	41,818	27,366
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	34,885	22,528
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(31)	(86)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value		4,838
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses		(12)
Contractual maturities - Amortized Cost
Amortized Cost	41,843	27,464
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	41,818	27,366
Corporate debt
Total available-for-sale securities
Amortized Cost	35,447	42,006
Gross Unrealized Gains	9
Gross Unrealized Losses	(47)	(415)
Estimated Fair Value	35,409	41,591
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	23,262	19,693
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(33)	(138)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	2,618	21,898
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(15)	(277)
Contractual maturities - Amortized Cost
Amortized Cost	35,447	42,006
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	35,409	41,591
Commercial paper
Total available-for-sale securities
Amortized Cost	9,944	15,682
Estimated Fair Value	9,944	15,682
Contractual maturities - Amortized Cost
Amortized Cost	9,944	15,682
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	$ 9,944	$ 15,682