Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Total available-for-sale securities
Amortized Cost	$ 106,263		$ 148,483
Gross Unrealized Losses	(388)		(995)
Estimated Fair Value	105,875		147,488
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	73,046		82,012
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(233)		(308)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	12,069		49,793
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(155)		(687)
Contractual maturities - Amortized Cost
Amortized Cost, Due in one year or less	99,537
Amortized Cost, Due after one year through two years	6,726
Amortized Cost	106,263		148,483
Contractual maturities - Estimated Fair Value
Estimated Fair Value, Due in one year or less	99,192
Estimated Fair Value, Due after one year through two years	6,683
Available-for-sale Securities, Debt Securities, Total	105,875		147,488
Realized gains or losses
Realized gains or losses	0	$ 0
Unrealized losses	0	$ 0
U.S. treasuries
Total available-for-sale securities
Amortized Cost	12,133		63,331
Gross Unrealized Losses	(92)		(482)
Estimated Fair Value	12,041		62,849
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	4,681		39,791
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(4)		(84)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	7,361		23,057
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(88)		(398)
Contractual maturities - Amortized Cost
Amortized Cost	12,133		63,331
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	12,041		62,849
Government agency securities, Cash equivalents
Total available-for-sale securities
Amortized Cost	60,262		27,464
Gross Unrealized Losses	(208)		(98)
Estimated Fair Value	60,054		27,366
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	60,053		22,528
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(208)		(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	60,262		27,464
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	60,054		27,366
Corporate debt
Total available-for-sale securities
Amortized Cost	13,108		42,006
Gross Unrealized Losses	(88)		(415)
Estimated Fair Value	13,020		41,591
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	8,312		19,693
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(21)		(138)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	4,708		21,898
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(67)		(277)
Contractual maturities - Amortized Cost
Amortized Cost	13,108		42,006
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	13,020		41,591
Commercial paper
Total available-for-sale securities
Amortized Cost	20,760		15,682
Estimated Fair Value	20,760		15,682
Contractual maturities - Amortized Cost
Amortized Cost	20,760		15,682
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	$ 20,760		$ 15,682