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Stock award plan - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended
--- | --- | --- | ---
Mar. 05, 2013 | Jun. 30, 2016 | May 31, 2016 | May 31, 2013 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stock option plan |  |  |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 42,134 | $ 33,252 | $ 30,559
Unrecognized compensation cost |  |  |  |  | $ 111,500 |  |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  | 3 years |  |
Unvested restricted stock |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 306,549 |  |
Stock option |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 3,977,995 | 3,181,623 | 1,913,873
Forfeited (in shares) |  |  |  |  | 518,527 | 461,934 | 1,117,462
Expected dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00%
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 23.05 | $ 17.48 | $ 8.45
Stock option | Minimum |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Stock option | Maximum |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Granted (in shares) |  |  | 897,290 |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
Share-based compensation expense |  |  |  |  | $ 3,200 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 1,000,000,000,000 |  |
Award requisite service period |  |  |  |  | 6 months |  |
Purchase price of common stock |  |  |  |  | 85.00% |  |
Employee stock purchase plan, voting percentage limit |  | 5.00% |  |  |  |  |
Share-based compensation expense |  |  |  |  | $ 1,300 |  |
2013 Stock Incentive Plan |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Number of shares available for issuance (in shares) | 0 |  |  |  |  |  |
2013 Stock Incentive Plan | Common stock |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Number of shares authorized (in shares) | 739,937 |  |  |  |  |  |
2013 Stock Incentive Plan | Unvested restricted stock |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Options granted (in shares) | 735,324 |  |  |  |  |  |
2013 Stock Incentive Plan | Stock option |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Granted (in shares) | 4,613 |  |  |  |  |  |
2009 Equity and Long Term Incentive Plan |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  | 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% |  |
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% |  |
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% |  |
2009 Equity and Long Term Incentive Plan and 2013 Stock Incentive Plan | Common stock |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  | 122,296 |  |  |
2013 Long Term Incentive Plan | Common stock |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Number of shares available for issuance (in shares) |  |  |  |  | 467,808 |  |
Number of shares subject to outstanding awards (in shares) |  |  |  | 3,040,444 |  |  |
Annual increase in the number of shares on the first day of the fiscal year (in shares) |  |  |  | 2,500,000 |  |  |
Annual increase in the number of shares outstanding on the first day of the fiscal year |  |  |  | 4.00% |  |  |
Inducement grant plan | Stock option |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 1,675,075 |  |
Granted (in dollars per share) |  |  |  |  | $ 39.23 |  |
Forfeited (in shares) |  |  |  |  | 250,153 |  |

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