Segment - Schedule of Reporting Segment (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025
Segment Reporting [Line Items]
Revenue	$ 4	$ 8	$ 6	$ 15
Net loss	44,755	42,684	68,908	94,879
SPA Put/Call Liability | Level 3
Segment Reporting [Line Items]
Change in fair value			17,561
Reportable segment
Segment Reporting [Line Items]
Revenue	4	8	6	15
Technical operations	12,236	11,176	24,630	29,071
Clinical development	15,094	9,486	27,737	18,160
Support functions	5,211	5,672	10,849	14,127
Lease costs	3,715	4,377	7,424	8,823
Operations management	2,447	3,289	5,174	8,273
Research activities	2,775	2,460	5,185	5,990
Other segment items	3,281	6,232	(12,085)	10,450
Net loss	$ 44,755	$ 42,684	68,908	$ 94,879
Reportable segment | SPA Put/Call Liability | Level 3
Segment Reporting [Line Items]
Change in fair value			$ 17,600