Fair Value Measurements - Schedule of Cost Or Amortized Cost, Gross Unrealized Gains, Gross Unrealized Losses, And Total Estimated Fair Value Of Financial Assets (Details) - Fair Value Measurements Recurring - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	$ 190,901	$ 196,765
Gross Unrealized Gains		3
Gross Unrealized Losses	(1,730)	(42)
Total Estimated Fair Value	189,171	196,726
Money Market Funds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	27,430	113,058
Gross Unrealized Gains
Gross Unrealized Losses
Total Estimated Fair Value	27,430	113,058
U.S. Government Agency Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	94,276	18,314
Gross Unrealized Gains
Gross Unrealized Losses	(1,249)	(23)
Total Estimated Fair Value	93,027	18,291
Corporate Notes and Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	36,374	36,975
Gross Unrealized Gains		3
Gross Unrealized Losses	(379)	(12)
Total Estimated Fair Value	35,995	36,966
Yankee Bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	1,920
Gross Unrealized Gains
Gross Unrealized Losses	(2)
Total Estimated Fair Value	1,918
Commercial Paper
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	18,291	16,489
Gross Unrealized Gains
Gross Unrealized Losses
Total Estimated Fair Value	18,291	16,489
Treasury Bill
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	4,500	4,494
Gross Unrealized Gains
Gross Unrealized Losses	(10)	(4)
Total Estimated Fair Value	4,490	4,490
Asset-Backed Securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost or Amortized Cost	8,110	7,435
Gross Unrealized Gains
Gross Unrealized Losses	(90)	(3)
Total Estimated Fair Value	$ 8,020	$ 7,432