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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Stock option plan |  |  |  |  |  |  |
Additional compensation recognized due to modifications to the options granted |  |  |  |  |  |  | $ 1,900
Share-based compensation expense |  |  |  |  | $ 30,559 | $ 35,009 | $ 33,979
Unrecognized compensation cost |  |  |  |  | $ 38,200 |  |
Weighted average remaining service period for recognition of unrecognized compensation cost |  |  |  |  | 1 year 10 months 28 days |  |
Unvested restricted stock |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Options granted (in shares) |  |  |  |  | 365,194 |  |
Stock option |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 1,913,873 | 1,500,645 | 2,201,800
Forfeited (in shares) |  |  |  |  | 1,117,462 | 383,590 | 152,047
Expected dividend yield |  |  |  |  | 0.00% | 0.00% | 0.00%
Weighted average grant date fair value (in dollars per share) |  |  |  |  | $ 8.45 | $ 17.31 | $ 50.81
Stock option | Maximum |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Vesting period |  |  |  |  | 4 years |  |
Stock option | Minimum |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Vesting period |  |  |  |  | 3 years |  |
Stock Appreciation Rights (SARs) |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Granted (in shares) |  |  | 897,290 |  |  |  |
Vesting period |  |  | 4 years |  |  |  |
Share-based compensation expense |  |  |  |  | $ 1,900 |  |
Employee Stock Purchase Plan |  |  |  |  |  |  |
Stock option plan |  |  |  |  |  |  |
Number of shares authorized (in shares) |  |  |  |  | 1,000,000 |  |
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 |  |  |  |  | $ 900 |  |
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) |  |  |  |  | 927,478 |  |
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 |  |  |  |  |  |  |
Granted (in shares) |  |  |  |  | 640,550 |  |
Granted (in dollars per share) |  |  |  |  | $ 14.16 |  |
Forfeited (in shares) |  |  |  |  | 316,176 |  |

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- Definition The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2)(iii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + 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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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