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Stockholders' equity (deficit) - Share-based Payment Award Plans - Additional Information (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Class Of Stock [Line Items]          
Share-based payment arrangement, expense $ 0.2 $ 4.3 $ 1.2 $ 8.5  
Total unrecognized share based compensation 0.4   0.4    
Compensation cost expected to be recognized $ 0.4   $ 0.4    
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 382,207   382,207    
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 392,504   392,504