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Stock-based compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Mar. 07, 2024 | Jun. 30, 2024 | Jun. 30, 2024
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock options granted (in shares) |  |  | 3,055,807
Stock options granted, weighted average exercise price (in dollars per share) |  |  | $ 6.95
Stock options granted, weighted average grant date fair value (in dollars per share) |  |  | $ 5.70
2020 Stock Option and Incentive Plan |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Stock options granted, weighted average exercise price (in dollars per share) | $ 22.00 |  |
New exercise price per share, tranche one (in dollars per share) | 19.00 |  |
New exercise price per share, tranche two (in dollars per share) | $ 11.88 |  |
Share-based payment arrangement, plan modification, incremental cost |  | $ 0.4 | $ 0.5
Stock Options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation costs |  | 50.1 | $ 50.1
Expected to be recognized over a weighted average period |  |  | 2 years 4 months 24 days
Performance-based RSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation costs |  | $ 3.0 | $ 3.0
Units vested (in shares) |  |  | 0
Share-based compensation, number of common stock issuable per RSU vested (in shares) |  | 1 | 1
Time-based RSUs |  |  |
Share Based Compensation Arrangement By Share Based Payment Award [Line Items] |  |  |
Unrecognized compensation costs |  | $ 9.7 | $ 9.7
Expected to be recognized over a weighted average period |  |  | 3 years 3 months 18 days
Units vested (in shares) |  |  | 136,837
Granted (in shares) |  |  | 1,013,350
Number of shares retained to cover statutory minimum withholding taxes (in shares) |  |  | 15,321

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