Business Overview and Basis of Presentation (Details) - USD ($) $ in Thousands	3 Months Ended				6 Months Ended
	Jun. 30, 2023	Mar. 31, 2023	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2023	Jun. 30, 2022	Dec. 31, 2022
Accounting Policies [Abstract]
Net loss	$ (58,797)	$ (68,801)	$ (44,688)	$ (60,598)	$ (127,598)	$ (105,286)
Accumulated deficit	(729,831)				(729,831)		$ (602,233)
Cash and cash equivalents	950,157		$ 1,220,273		950,157	$ 1,220,273	$ 1,183,846
Short-term investments	$ 432,400				$ 432,400