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Stock-based compensation - Narrative (Details) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
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Mar. 08, 2024 USD ($) peer $ / shares shares | Jan. 03, 2023 USD ($) peer shares | Feb. 24, 2022 USD ($) peer shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) shares | Dec. 31, 2023 USD ($) $ / shares
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Aggregate intrinsic value of exercisable service vesting-based stock options |  |  |  | $ 3,600,000 |  | $ 3,600,000 |  |
Intrinsic value of service vesting-based awards exercised |  |  |  | $ 500,000 |  | $ 1,100,000 |  |
Service based-vesting options granted (in shares) | shares |  |  |  | 0 |  | 0 |  |
Weighted average remaining contractual life (year) |  |  |  |  |  | 1 year 6 months |  |
Share-based payment arrangement, expense |  |  |  | $ 5,324,000 | $ 7,984,000 | $ 16,022,000 | $ 19,715,000 |
Number of peers | peer | 20 | 20 | 20 |  |  |  |  |
Comprehensive loss |  |  |  | (1,356,000) | $ (29,293,000) | $ (32,506,000) | $ (53,026,000) |
Vesting period (year) |  |  |  |  |  | 4 years |  |
Adjustment |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Comprehensive loss |  |  |  |  |  |  |  | $ (1,600,000)
Options |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options |  |  |  | 0 |  | $ 0 |  |
Restricted Stock |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options |  |  |  | 26,800,000 |  | 26,800,000 |  |
Aggregate fair value of the service vesting-based awards granted |  |  |  | 6,700,000 |  | 10,000,000.0 |  |
Aggregate fair value of the service vesting-based awards that vested |  |  |  | 2,300,000 |  | 8,000,000.0 |  |
Share-based payment arrangement, expense |  |  |  | $ 3,800,000 |  | $ 11,700,000 |  |
Period for recognition (year) |  |  |  |  |  | 2 years 8 months 12 days |  |
Granted (in shares) | shares |  |  |  |  |  | 484,886 |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 16.22 |  | $ 16.22 |  | $ 18.32
Vested (in shares) | shares |  |  |  |  |  | 701,436 |  |
Performance Shares |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options |  |  |  | $ 1,200,000 |  | $ 1,200,000 |  |
Service based-vesting options granted (in shares) | shares |  |  |  |  | 0 |  | 0 |
Share-based payment arrangement, expense |  |  |  | 200,000 |  | $ 700,000 |  |
Period for recognition (year) |  |  |  |  |  | 1 year 2 months 12 days |  |
Granted (in shares) | shares | 109,512 |  |  |  |  |  |  |
Grant date fair value (in dollars per share) | $ / shares | $ 17.36 |  |  |  |  |  |  |
Aggregate fair value of the market-based awards granted |  |  |  | $ 1,900,000 |  | $ 1,900,000 |  |
Vested (in shares) | shares |  |  |  | 0 |  | 0 |  |
Market-based Restricted Stock |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Unrecognized compensation costs for service vesting-based stock options |  |  |  | $ 4,400,000 |  | $ 4,400,000 |  |
Share-based payment arrangement, expense |  |  |  | $ 1,300,000 | $ 1,600,000 | $ 3,700,000 | $ 4,900,000 |
Period for recognition (year) |  |  |  |  |  | 1 year 1 month 6 days |  |
Granted (in shares) | shares | 300,529 |  |  |  |  | 299,565 |  |
Grant date fair value (in dollars per share) | $ / shares |  |  |  | $ 25.70 |  | $ 25.70 |  | $ 26.50
Aggregate fair value of the market-based awards granted |  |  |  | $ 0 | 0 | $ 6,300,000 | 6,500,000 |
Vested (in shares) | shares |  |  |  |  |  | 300,529 |  |
Total shareholder return attainment (percent) | 125.00% |  |  |  |  |  |  |
Historical volatility (percent) | 80.00% | 78.00% | 63.00% |  |  |  |  |
Dividend yield (percent) | 0.00% | 0.00% | 0.00% |  |  |  |  |
Risk-free interest rate | 4.60% | 4.40% | 1.50% |  |  |  |  |
Measurement date with a maturity period (year) | 2 years | 2 years | 2 years |  |  |  |  |
Aggregate fair value of the market-based awards that vested |  |  |  | $ 0 | $ 0 | $ 5,100,000 | $ 700,000 |
Market-based Restricted Stock | Minimum |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total shareholder return attainment (percent) | 0.00% | 0.00% |  |  |  |  |  |
Market-based Restricted Stock | Maximum |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Total shareholder return attainment (percent) | 200.00% | 200.00% |  |  |  |  |  |
Market-based Restricted Stock | Executive Officer |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items] |  |  |  |  |  |  |  |
Share-based payment arrangement, expense | $ 6,300,000 | $ 6,800,000 | $ 6,700,000 |  |  |  |  |
Granted (in shares) | shares | 239,464 | 268,738 | 240,428 |  |  |  |  |

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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c)(1)(iv)(01) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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