Segment - Schedule of Reporting Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Revenue	$ 36	$ 61	$ 130
Net loss	274,448	342,994	234,632
Reportable segment
Segment Reporting Information [Line Items]
Revenue	36	61	130
Technical operations	47,202	46,102	49,851
Clinical development	36,671	38,561	27,241
Support functions	25,737	29,870	34,096
Lease costs	16,643	16,885	14,788
Operations management	13,106	14,145	22,814
Research activities	11,038	25,284	33,309
Other segment items	124,087	172,208	52,663
Net loss	$ 274,448	$ 342,994	$ 234,632