Income Taxes - Components of net deferred taxes (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Dec. 31, 2024
Deferred tax assets:
Net operating loss carryforwards	$ 58,177	$ 53,984
R&D tax credit	19,363	837
Deferred R&D expenses	36,095	32,729
Accrued expenses	840	1,903
Share-based compensation	2,423	978
Intangible assests	7,005	424
Other	91	0
Total deferred tax assets	123,994	90,855
Valuation allowance	(123,994)	(90,855)
Deferred tax assets, net of valuation allowance	$ 0	$ 0