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Share-based compensation and stockholders' equity - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 17, 2024 | Sep. 30, 2024 | Jun. 30, 2023 | Sep. 30, 2024 | Dec. 31, 2023 | May 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Nonvested options forfeited (in shares) |  |  |  | 1,000,000 |  |
Warrant liability |  | $ 13.9 |  | $ 13.9 | $ 0.0 |
Level 3 |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Warrant liability |  | $ 13.9 |  | $ 13.9 | $ 0.0 |
Series I Warrants |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Class of warrant or right, number of securities called by warrants or rights (in shares) |  | 1,000,000 |  | 1,000,000 |  |
Series II Warrants |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Class of warrant or right, number of securities called by warrants or rights (in shares) |  | 1,500,000 |  | 1,500,000 |  |
Subscription Agreement |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) | 1,100,000 |  |  |  |  |
Consideration received on transaction | $ 10.0 |  |  |  |  |
Sale of stock, price per share (in dollars per share) | $ 8.98 |  |  |  |  |
Liabilities, fair value adjustment |  | $ 1.6 |  | $ 1.6 |  |
At-The-Market Offering |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Sale of stock, number of shares issued in transaction (in shares) |  | 0 | 1,100,000 |  |  |
Sale of stock, price per share (in dollars per share) |  |  | $ 8.22 |  |  |
Sale of stock, aggregate offering amount, maximum |  |  |  |  |  | $ 150.0
Sale of stock, consideration received on transaction, gross |  |  | $ 9.1 |  |  |
Sale of stock, amount remaining available for sale of shares |  | $ 140.9 |  | $ 140.9 |  |
Stock Options |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted (in shares) |  |  |  | 4,100,000 |  |
Stock Options | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Stock Options | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Stock Options | Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Performance Stock Option |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Stock options granted (in shares) |  |  |  | 800,000 |  |
Award vesting period |  |  |  | 5 years |  |
Restricted Stock Units |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Equity instruments other than options granted (in shares) |  |  |  | 200,000 |  |
Equity instruments other than options, forfeited in period (in shares) |  |  |  | 400,000 |  |
Restricted Stock Units | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Restricted Stock Units | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Restricted Stock Units | Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Long-Term Incentive Award |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Granted long-term incentive award |  |  |  | $ 8.0 |  |
Award vesting period |  |  |  | 5 years |  |
Performance Shares |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting period |  |  |  | 3 years |  |
Equity instruments other than options, forfeited in period (in shares) |  |  |  | 100,000 |  |
Performance Shares | Tranche One |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Performance Shares | Tranche Two |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |
Performance Shares | Tranche Three |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |
Award vesting rights, percentage |  |  |  | 33.33% |  |

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