Marketable Securities - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Fair Value to Amortized Cost
Amortized Cost	$ 133,982	$ 310,505
Allowance for Credit Losses	0	0
Net Amortized Cost	133,982	310,505
Gross Unrealized Gains	3	51
Gross Unrealized Losses	(86)	(196)
Fair Value	133,899	310,360
Cash and cash equivalents
Fair Value to Amortized Cost
Fair Value	5,000	49,896
Marketable securities
Fair Value to Amortized Cost
Fair Value	128,899	260,464
U.S. corporate bonds
Fair Value to Amortized Cost
Amortized Cost	64,635	142,697
Allowance for Credit Losses	0	0
Net Amortized Cost	64,635	142,697
Gross Unrealized Gains	0	25
Gross Unrealized Losses	(62)	(135)
Fair Value	64,573	142,587
Foreign corporate bonds
Fair Value to Amortized Cost
Amortized Cost	24,623	36,766
Allowance for Credit Losses	0	0
Net Amortized Cost	24,623	36,766
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(19)	(32)
Fair Value	24,604	36,743
U.S. treasury bills
Fair Value to Amortized Cost
Amortized Cost	39,759	89,308
Allowance for Credit Losses	0	0
Net Amortized Cost	39,759	89,308
Gross Unrealized Gains	3	17
Gross Unrealized Losses	0	(5)
Fair Value	39,762	89,320
U.S. agency bonds
Fair Value to Amortized Cost
Amortized Cost	4,965	41,734
Allowance for Credit Losses	0	0
Net Amortized Cost	4,965	41,734
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(5)	(24)
Fair Value	$ 4,960	$ 41,710