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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Dec. 31, 2024 | Apr. 30, 2022 | May 31, 2021 | Jan. 31, 2020
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 19,426 | $ 19,755 | $ 56,029 | $ 57,376 |  |  |  |
Unrecognized compensation cost |  |  |  |  |  |  | 137,200 |  | $ 137,200 |  |  |  |  |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  |  |  |  |  | 2 years 9 months 18 days |  |  |  |  |
Stock option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 841,945 |  |  |  |  |
Options forfeited (in shares) |  |  |  |  |  |  |  |  | 564,709 |  |  |  |  |
Expected dividend yield (as a percent) |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  |  |  | $ 25.44 |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 1,615,305 |  |  |  |  |
Performance-based restricted stock units (PSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | 100 |  | $ 500 |  |  |  |  |
Performance-based restricted stock units (PSUs) | Chief Executive Officer |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  | 25,000 | 150,000 |  |  |  |  |  | 131,250 |  | 206,250 |  |  |
Share-based compensation expense |  |  |  |  |  |  | 1,000 |  | $ 1,000 |  |  |  |  |
Performance period |  | 5 years | 2 years |  |  |  |  |  |  |  |  |  |  |
PSUs with performance or market conditions satisfied during the period |  |  |  |  |  |  |  |  | 75,000 |  |  |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 2,000,000 |  |  |  |  |  |  |  | 1,000,000 |
Award requisite service period |  |  |  |  | 6 months |  |  |  |  |  |  |  |  |
Purchase price of common stock, percent |  |  |  |  | 85.00% |  |  |  |  |  |  |  |  |
Employee stock purchase plan, voting percentage limit |  |  |  |  | 5.00% |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  |  |  | $ 600 |  | $ 1,600 |  |  |  |  |
Amended 2013 LTIP |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  |  |  | 5,204,816 |  | 5,204,816 |  |  |  |  |
Number of additional shares authorized (in shares) | 8,475,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Amended 2013 LTIP | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | 16,724,212 |  |  |  |  |  |  |  |  |  |  |  |  |
2020 Inducement Stock Incentive Plan | Common stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  |  |  | 1,802,161 |  | 1,802,161 |  |  |  |  |
Number of additional shares authorized (in shares) |  |  |  | 1,700,000 |  | 1,000,000 |  |  |  |  |  |  |  |
2020 Inducement Stock Incentive Plan | Common stock | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 1,300,000 |  | 1,000,000
2020 Inducement Stock Incentive Plan | Stock option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 51,200 |  |  |  |  |
Stockholder's specified ownership percentage |  |  |  |  |  |  | 10.00% |  | 10.00% |  |  |  |  |
Vesting period |  |  |  |  |  |  |  |  | 4 years |  |  |  |  |
2020 Inducement Stock Incentive Plan | Stock option | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted, exercise price as percentage of the fair market value of common stock at grant date |  |  |  |  |  |  | 100.00% |  | 100.00% |  |  |  |  |
2020 Inducement Stock Incentive Plan | Stock option | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock options granted to stockholder with specified ownership percentage, exercise price as percentage of the fair market value of common stock at grant date |  |  |  |  |  |  | 110.00% |  | 110.00% |  |  |  |  |
Expiration period |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |
2020 Inducement Stock Incentive Plan | Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  |  |  | 107,050 |  |  |  |  |

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- Definition The number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan. + 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)(03) -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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Purchase price of common stock expressed as a percentage of its fair value. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-4 + Details
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