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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Mar. 05, 2013 | Dec. 31, 2020 | May 31, 2016 | May 31, 2013 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jan. 31, 2020
Stock option plan |  |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 70,325 | $ 42,134 | $ 33,252 |
Unrecognized compensation cost |  | $ 159,000 |  |  | $ 159,000 |  |  |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  | 2 years 8 months 23 days |  |  |
Unvested restricted stock |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 663,045 |  |  |
Stock option |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 2,777,975 | 3,977,995 | 3,181,623 |
Forfeited (in shares) |  |  |  |  | 889,785 | 518,527 | 461,934 |
Expected dividend yield (as a percent) |  |  |  |  | 0.00% | 0.00% | 0.00% |
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 36.94 | $ 23.05 | $ 17.48 |
Stock option | Maximum |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |  |
SARs |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) |  |  | 897,290 |  |  |  |  |
Vested (in shares) |  |  |  |  | 132,136 |  |  |
Vesting period |  |  | 4 years |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 0 |  |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  | 1,000,000 |  |  | 1,000,000 |  |  |
Award requisite service period |  |  |  |  | 6 months |  |  |
Share-based compensation expense |  |  |  |  | $ 1,900 |  |  |
Employee Stock Purchase Plan | Minimum |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Purchase price of common stock, percent |  |  |  |  | 85.00% |  |  |
Employee stock purchase plan, voting percentage limit |  |  |  |  | 5.00% |  |  |
2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  | 122,296 |  |  |  |
2009 Equity and Long Term Incentive Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares available for issuance |  |  |  | 0 |  |  |  |
Number of additional shares authorized (in shares) |  |  |  | 2,500,000 |  |  |  |
2009 Equity and Long Term Incentive Plan | Stock option |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Stockholder's specified ownership percentage |  | 10.00% |  |  | 10.00% |  |  |
Expiration period |  |  |  |  | 10 years |  |  |
2009 Equity and Long Term 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% |  |  |
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% |  |  |
2013 Stock Incentive Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares authorized (in shares) | 739,937 |  |  |  |  |  |  |
Number of shares available for issuance | 0 |  |  |  |  |  |  |
2013 Stock Incentive Plan | Unvested restricted stock |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) | 735,324 |  |  |  |  |  |  |
2013 Stock Incentive Plan | Stock option |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) | 4,613 |  |  |  |  |  |  |
2013 Long Term Incentive Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares available for issuance |  | 941,381 |  |  | 941,381 |  |  |
Share based Compensation Arrangement by Share based Payment Award Number of Shares Authorized Annual Increase Number |  |  |  | 2,500,000 |  |  |  |
Annual increase in the number of shares outstanding on the first day of the fiscal year |  |  |  | 4.00% |  |  |  |
2013 Long Term Incentive Plan | Maximum |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares subject to outstanding awards (in shares) |  |  |  | 3,040,444 |  |  |  |
2020 Inducement Stock Incentive Plan |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares available for issuance |  | 1,186,005 |  |  | 1,186,005 |  |  |
Number of additional shares authorized (in shares) |  | 1,000,000 |  |  |  |  |  |
2020 Inducement Stock Incentive Plan | Maximum |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  |  |  |  | 1,000,000
2020 Inducement Stock Incentive Plan | Restricted stock units |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 73,645 |  |  |
Inducement Grant Plan -Nasdaq exception | Stock option |  |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 740,350 |  |  |
Granted (in dollars per share) |  |  |  |  | $ 51.33 |  |  |
Forfeited (in shares) |  |  |  |  | 357,052 |  |  |

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