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Stockholders' equity
 3 Months Ended
Mar. 31, 2016
Equity [Abstract]  
Stockholders' equity
Stockholders' equity
Share-based compensation
During the three months ended March 31, 2016, the Company granted 818,620 options and 1,670,270 shares of restricted stock or restricted stock units, which includes 257,900 performance share awards with a market condition. The stock options were granted with an exercise price of $9.39. Of the restricted stock or restricted stock units granted, 1,292,553 vest ratably over four years on each anniversary of the date of grant. 119,817 shares of restricted stock or restricted stock units were granted to the non-employee members of the Board of Directors, which have a twelve month vesting period from the date of grant. The performance share awards granted may settle for between zero and two shares of the Company's common stock. The number of shares issued pursuant to the performance share awards will be determined based on the total shareholder return of the Company's common stock as compared to a group of peer companies, measured annually over a one year, two year and three-year performance period.