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Income taxes - Additional Information (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax [Line Items] |  |  |  |
Loss before income taxes | $ 33,399,000 | $ (5,393,000) |  |
Income Tax Expense (Benefit) | 1,140,000 | (185,000) |  |
Operating Loss Carryforwards | $ 29,300,000 |  |  |
Percentage of tax earnings | 80.00% |  |  |
Deferred Tax Assets, Valuation Allowance | $ 15,149,000 | $ 19,033,000 | $ 19,000,000.0 | $ 11,300,000
Reduction in valuation allowance | 3,900,000 |  |  |
Net Operating Loss Due to additional income | 16,800,000 |  |  |
No Expiration [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating Loss Carryforwards | 0 |  |  |
State and Local Jurisdiction [Member] |  |  |  |
Income Tax [Line Items] |  |  |  |
Operating Loss Carryforwards | $ 21,000,000.0 |  |  |

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