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Income taxes - Schedule of components of deferred tax assets and liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Deferred tax assets: |  |
Fixed assets and intangibles | $ 17 | $ 135
Leases | 378 | 106
Accrued expenses | 2,741 | 2,066
Net operating loss carryforward | 31,868 | 6,679
Stock options | 5,508 | 0
Investment difference | 0 | 148
R&D credit carryforward | 616 | 325
Other | 402 | 0
Subtotal | 41,530 | 9,459
Less: valuation allowance | (40,760) | (9,297)
Total deferred tax assets | 770 | 162
Deferred tax liabilities: |  |
Leases | (370) | (101)
Prepaid expenses | (400) | (61)
Total deferred tax liability | (770) | (162)
Net deferred tax asset (liability) | $ 0 | $ 0

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