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Income taxes - Additional Information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Income taxes |  |
Change in valuation allowance | $ 3,428 | $ 3,583
Interest Limitation Carryforwards | 133 |
State and Local Jurisdiction |  |
Income taxes |  |
State net operating loss carryforward | 22,416 |
Net operating losses, subject to expiration | 20,218 |
Net operating losses, Not subject to expiration | 2,198 |
Domestic Tax Authority |  |
Income taxes |  |
U.S. net operating loss carryforwards | 16,771 |
Net operating losses, Not subject to expiration | $ 16,771 |

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