Income Taxes - Components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Accrued compensation	$ 1,816	$ 1,302
Leases	98	34
Share-based compensation	5,702	3,163
Research and experimental costs capitalized	0	9,556
Net operating loss carryforwards	143	294
Start-up costs	232	32
Deferred tax assets before valuation allowance	7,991	14,381
Valuation allowance	(6,928)	(12,888)
Deferred Tax Assets, Net of Valuation Allowance, Total	1,063	1,493
Deferred tax liabilities:
Fixed assets	1,051	1,481
Prepaid expenses	12	12
Total deferred income tax liabilities	1,063	1,493
Net deferred tax asset	$ 0	$ 0