Marketable Securities - Amortized Cost and Fair Value of Debt Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Fair Value to Amortized Cost
Amortized Cost	$ 273,272	$ 310,505
Allowance for Credit Losses	0	0
Net Amortized Cost	273,272	310,505
Gross Unrealized Gains	48	51
Gross Unrealized Losses	(326)	(196)
Fair Value	272,994	310,360	$ 310,360
Cash and cash equivalents
Fair Value to Amortized Cost
Fair Value	9,996		49,896
Marketable securities
Fair Value to Amortized Cost
Fair Value	262,998		$ 260,464
U.S. corporate bonds
Fair Value to Amortized Cost
Amortized Cost	142,186	142,697
Allowance for Credit Losses	0	0
Net Amortized Cost	142,186	142,697
Gross Unrealized Gains	45	25
Gross Unrealized Losses	(250)	(135)
Fair Value	141,981	142,587
Foreign corporate bonds
Fair Value to Amortized Cost
Amortized Cost	49,200	36,766
Allowance for Credit Losses	0	0
Net Amortized Cost	49,200	36,766
Gross Unrealized Gains	0	9
Gross Unrealized Losses	(45)	(32)
Fair Value	49,155	36,743
U.S. treasury bills
Fair Value to Amortized Cost
Amortized Cost	39,788	89,308
Allowance for Credit Losses	0	0
Net Amortized Cost	39,788	89,308
Gross Unrealized Gains	3	17
Gross Unrealized Losses	(9)	(5)
Fair Value	39,782	89,320
U.S. agency bonds
Fair Value to Amortized Cost
Amortized Cost	42,098	41,734
Allowance for Credit Losses	0	0
Net Amortized Cost	42,098	41,734
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(22)	(24)
Fair Value	$ 42,076	$ 41,710