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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Deferred tax assets:    
Net operating loss carryforwards $ 8,491 $ 6,847
Tax credit carryforwards 3,791 3,112
Equity-based compensation 477 407
Operating lease liabilities 114 148
Capitalized research expenditures 16,089 11,371
Deferred grant income 224 223
Other 324 246
Deferred tax assets 29,510 22,354
Less: valuation allowance (29,400) (22,207)
Deferred tax assets after valuation allowance 110 147
Deferred tax liabilities    
Property and equipment, net (4) (8)
Right-of-use assets, operating leases (106) (139)
Deferred tax liabilities $ (110) $ (147)