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Stockholders' equity (deficit) - Share-based Payment Award Plans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Class Of Stock [Line Items]          
Share-based payment arrangement, expense $ 0.4 $ 2.2 $ 0.9 $ 4.3  
Total unrecognized share based compensation 0.5   0.5    
Compensation cost expected to be recognized $ 0.5   $ 0.5    
Share-based compensation over a weighted average period     7 months 6 days    
Performance Shares Units [Member]          
Class Of Stock [Line Items]          
Number of shares outstanding 269,207   269,207    
Share-based compensation arrangement by share-based payment award, vesting percentage         100.00%
2019 Stock Incentive Plan [Member]          
Class Of Stock [Line Items]          
Remaining shares of common stock available for future issuance 321,717   321,717