Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Total available-for-sale securities
Amortized Cost	$ 103,349		$ 104,512
Gross Unrealized Losses	(1,487)		(331)
Estimated Fair Value	101,862		104,181
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	51,035		103,182
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(604)		(331)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	44,942		0
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(883)
Contractual maturities - Amortized Cost
Amortized Cost, Due in one year or less	97,762
Amortized Cost, Due after one year through two years	5,587
Amortized Cost	103,349		104,512
Contractual maturities - Estimated Fair Value
Estimated Fair Value, Due in one year or less	96,468
Estimated Fair Value, Due after one year through two years	5,394
Available-for-sale Securities, Debt Securities, Total	101,862		104,181
Realized gains or losses
Realized gains or losses	0	$ 0
U.S. treasuries
Total available-for-sale securities
Amortized Cost	47,084		51,269
Gross Unrealized Losses	(732)		(174)
Estimated Fair Value	46,352		51,095
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	16,973		51,095
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(122)		(174)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	29,379
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(610)
Contractual maturities - Amortized Cost
Amortized Cost	47,084		51,269
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	46,352		51,095
Government agency securities
Total available-for-sale securities
Amortized Cost	12,991		12,075
Gross Unrealized Losses	(112)		(23)
Estimated Fair Value	12,879		12,052
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	8,082		12,052
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(59)		(23)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	4,797
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(53)
Contractual maturities - Amortized Cost
Amortized Cost	12,991		12,075
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	12,879		12,052
Corporate debt
Total available-for-sale securities
Amortized Cost	37,389		40,169
Gross Unrealized Losses	(643)		(134)
Estimated Fair Value	36,746		40,035
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	25,980		40,035
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(423)		(134)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	10,766
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(220)
Contractual maturities - Amortized Cost
Amortized Cost	37,389		40,169
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	36,746		40,035
Commercial paper
Total available-for-sale securities
Amortized Cost	5,885		999
Estimated Fair Value	5,885		999
Contractual maturities - Amortized Cost
Amortized Cost	5,885		999
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	$ 5,885		$ 999