Segment Reporting (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($) segment	Dec. 31, 2024 USD ($)
Segment Reporting [Abstract]
Number of reportable segments | segment	1
Segment Reporting Information [Line Items]
Total general and administrative expenses	$ 30,508	$ 18,770
Total operating expenses	155,604	82,389
Operating loss	(155,604)	(82,389)
Interest income	17,871	14,581
Total other income, net	17,871	14,581
Net loss before income taxes	(137,733)	(67,808)
Segment and consolidated net loss	(137,950)	(67,995)
Reportable Segment
Segment Reporting Information [Line Items]
Clinical operations and development	47,630	27,146
Manufacturing and process development	48,798	23,411
Research and development personnel cost and other (including stock-based compensation)	25,544	10,330
Research	3,124	2,732
Total research and development	125,096	63,619
General and administrative personnel costs (including stock-based compensation)	20,582	12,545
Professional fees	5,910	3,696
Facility costs, IT, office expense and other	4,016	2,529
Total general and administrative expenses	30,508	18,770
Total operating expenses	155,604	82,389
Operating loss	(155,604)	(82,389)
Interest income	17,871	14,581
Total other income, net	17,871	14,581
Net loss before income taxes	(137,733)	(67,808)
Income tax expense	(217)	(187)
Segment and consolidated net loss	$ (137,950)	$ (67,995)