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Income taxes - Reconciliation of the Company's actual tax rate to the U.S. Federal statutory rate (Details)
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Income tax rates    
- Statutory U.S. federal rate 21.00% 21.00%
- State income taxes, net of federal benefit 4.00% 0.00%
- Excess tax benefits related to stock compensation (1.00%) (4.00%)
- 162m limitation 1.00% 0.00%
- PPP Benefit 0.00% (2.00%)
- Change in valuation allowance (13.00%) (12.00%)
- Other true-up (1.00%) 0.00%
Total 11.00% 3.00%