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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 08, 2022 | Dec. 31, 2022 | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2024 | Apr. 30, 2022 | May 31, 2021 | Jan. 31, 2020
Stock option plan |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 18,543 | $ 19,243 | $ 36,603 | $ 37,621 |  |  |
Unrecognized compensation cost |  |  |  |  | 153,300 |  | $ 153,300 |  |  |  |
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) |  |  |  |  |  |  | 822,470 |  |  |  |
Options forfeited (in shares) |  |  |  |  |  |  | 531,684 |  |  |  |
Expected dividend yield (as a percent) |  |  |  |  |  |  | 0.00% |  |  |  |
Weighted average grant date fair value (in dollars per share) |  |  |  |  |  |  | $ 25.3 |  |  |  |
Restricted stock units |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  |  |  | 1,576,245 |  |  |  |
Performance-based restricted stock units (PSUs) - Stock price goals |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | 300 |  | $ 300 |  |  |  |
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 |  |  |  |  | $ 500 |  | $ 1,000 |  |  |  |
Amended 2013 LTIP |  |  |  |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  |  | 5,104,352 |  | 5,104,352 |  |  |  |
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 |  |  |  |  | 1,851,726 |  | 1,851,726 |  |  |  |
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) |  |  |  |  |  |  | 31,725 |  |  |  |
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) |  |  |  |  |  |  | 67,990 |  |  |  |

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