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Income Taxes - Deferred tax assets and liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2023
Dec. 31, 2022
Deferred tax assets:    
Net operating loss carryforwards $ 6,847 $ 8,194
Tax credit carryforwards 3,112 1,728
Equity-based compensation 407 307
Operating lease liabilities 148 178
Capitalized research expenditures 11,371 5,687
Deferred grant income 223 354
Other 246 165
Deferred tax assets 22,354 16,613
Less: valuation allowance (22,207) (16,435)
Deferred tax assets after valuation allowance 147 178
Deferred tax liabilities    
Property and equipment, net (8) (7)
Right-of-use assets, operating leases (139) (171)
Deferred tax liabilities $ (147) $ (178)