Basis of Presentation and Summary of Significant Accounting Policies - Use of Estimates (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Dec. 31, 2024
Accounting Policies [Abstract]
Accumulated deficit	$ (2,216,425)		$ (2,112,835)
Cash and cash equivalents	48,166		82,840
Marketable securities	59,465		$ 99,827
Liquid assets	107,600
Net cash used in operating activities	$ (97,954)	$ (158,936)