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Income taxes - Effective Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Income Tax Disclosure [Abstract] |  |  |
Federal tax expense | 21.00% | 21.00% | 21.00%
State taxes, net of federal benefit | 1.07% | 1.17% | 0.09%
Foreign rate differential | (0.12%) | (0.32%) | 0.07%
Withholding taxes | (0.0078) | (0.0306) | (0.0170)
Nondeductible compensation | (5.29%) | 0.00% | 0.00%
Stock-based compensation | 0.27% | (1.94%) | (2.77%)
Change in valuation allowance | (34.54%) | (21.16%) | (18.76%)
Research and development credits | 16.87% | 0.00% | 0.00%
Other | 0.02% | 0.08% | 0.07%
Effective tax rate | (1.50%) | (4.23%) | (2.00%)

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