Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Total available-for-sale securities
Amortized Cost	$ 123,118	$ 146,775
Gross Unrealized Gains		18
Gross Unrealized Losses	(232)	(129)
Estimated Fair Value	122,886	146,664
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	117,360	101,265
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(229)	(114)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	1,495	2,618
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(3)	(15)
Contractual maturities - Amortized Cost
Amortized Cost, Due in one year or less	112,231
Amortized Cost, Due after one year through two years	10,887
Amortized Cost	123,118	146,775
Contractual maturities - Estimated Fair Value
Estimated Fair Value, Due in one year or less	112,050
Estimated Fair Value, Due after one year through two years	10,836
Available-for-sale Securities, Debt Securities, Total	122,886	146,664
Realized gains or losses
Realized gains or losses	0
Unrealized losses	0
U.S. treasuries
Total available-for-sale securities
Amortized Cost	46,565	59,541
Gross Unrealized Gains		3
Gross Unrealized Losses	(101)	(51)
Estimated Fair Value	46,464	59,493
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	46,464	43,118
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(101)	(50)
Contractual maturities - Amortized Cost
Amortized Cost	46,565	59,541
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	46,464	59,493
Government agency securities
Total available-for-sale securities
Amortized Cost	25,455	41,843
Gross Unrealized Gains		6
Gross Unrealized Losses	(30)	(31)
Estimated Fair Value	25,425	41,818
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	25,425	34,885
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(30)	(31)
Contractual maturities - Amortized Cost
Amortized Cost	25,455	41,843
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	25,425	41,818
Corporate debt
Total available-for-sale securities
Amortized Cost	51,098	35,447
Gross Unrealized Gains		9
Gross Unrealized Losses	(101)	(47)
Estimated Fair Value	50,997	35,409
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	45,471	23,262
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(98)	(33)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	1,495	2,618
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(3)	(15)
Contractual maturities - Amortized Cost
Amortized Cost	51,098	35,447
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	$ 50,997	35,409
Commercial paper
Total available-for-sale securities
Amortized Cost		9,944
Estimated Fair Value		9,944
Contractual maturities - Amortized Cost
Amortized Cost		9,944
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total		$ 9,944