Business Overview and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2023	Jun. 30, 2023	Mar. 31, 2023	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Dec. 31, 2022
Accounting Policies [Abstract]
Net loss	$ (54,990)	$ (58,797)	$ (68,801)	$ (53,168)	$ (44,688)	$ (60,598)	$ (182,587)	$ (158,454)
Accumulated deficit	(784,821)						(784,821)		$ (602,233)
Cash and cash equivalents	947,749			$ 1,204,857			947,749	$ 1,204,857	$ 1,183,846
Short-term investments	$ 349,400						$ 349,400