Fair Value Measurements - Cost, Unrealized Gains or Losses, and Fair Value by Investment Type (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	$ 113,253	$ 191,623
Unrealized Gain	1	43
Unrealized (Loss)	(47)	(21)
Fair Value	113,207	191,645
Money Market Funds
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	62,389	55,060
Fair Value	62,389	55,060
U.S. government agency securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	18,134	19,929
Unrealized Gain		35
Unrealized (Loss)	(23)
Fair Value	18,111	19,964
US Treasury Securities
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	24,988	68,431
Unrealized Gain	1	8
Unrealized (Loss)	(3)	(21)
Fair Value	24,986	68,418
Commercial paper and corporate notes
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Cost	7,742	48,203
Unrealized (Loss)	(21)
Fair Value	$ 7,721	$ 48,203