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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2022 | Dec. 31, 2022 | Dec. 31, 2020 | Jun. 30, 2016 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022 | Apr. 30, 2022 | Jun. 30, 2021 | May 31, 2021 | Jan. 31, 2020
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 26,942 | $ 28,670 | $ 85,128 | $ 82,989 |  |  |  |
Unrecognized compensation cost |  |  |  |  | 179,300 |  | $ 179,300 |  |  |  |  |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  |  |  | 1 year 10 months 24 days |  |  |  |  |
Stock option |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 1,059,054 |  |  |  |  |
Expected dividend yield (as a percent) |  |  |  |  |  |  | 0.00% |  |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  | $ 21.83 |  |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 1,973,973 |  |  |  |  |
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 |  |  |  |  | $ 700 |  | $ 2,000 |  |  |  |  |
1998 Employee, Director, and Consultant Stock Option Plan, 2009 Equity and Long-term Incentive Plan, and 2013 Stock Incentive Plan | Common stock |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  | 0 |  | 0 |  |  |  |  |
Amended 2013 LTIP |  |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  | 6,802,210 |  | 6,802,210 |  |  |  |  |
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 |  |  |  |  | 1,705,941 |  | 1,705,941 |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |
Stockholder's specified ownership percentage |  |  |  |  | 10.00% |  | 10.00% |  |  |  |  |
Inducement grants for non-statutory stock options (in shares) |  |  |  |  |  |  | 121,460 |  |  |  |  |
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) |  |  |  |  |  |  | 83,210 |  |  |  |  |

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