Segment Reporting -Summary of Significant Segment Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2025	Mar. 31, 2024
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Share-based compensation	$ 8,859	$ 13,835
Net loss	44,773	43,857
Reconciliation of net loss
Adjustments and reconciling items	44,773	43,857
Net loss	44,773	43,857
Related Party
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Share-based compensation	300	5,700
Research and development, excluding compensation and share-based compensation	2,500	11,700
Reportable Segment
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Net loss	44,773	43,857
Reconciliation of net loss
Adjustments and reconciling items	44,773	43,857
Net loss	44,773	43,857
Reportable Segment | Operating Segments
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Compensation	6,991	4,174
Share-based compensation	8,859	13,835
Research and development, excluding compensation and share-based compensation	33,551	26,103
Other segment items	(4,628)	(255)
Net loss	44,773	43,857
Reconciliation of net loss
Adjustments and reconciling items	44,773	43,857
Net loss	44,773	43,857
Reportable Segment | Adjustments and reconciling items
Segment, Reconciliation of Other Items from Segments to Consolidated [Line Items]
Net loss	0	0
Reconciliation of net loss
Adjustments and reconciling items	0	0
Net loss	$ 0	$ 0