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Share-based compensation - 2014 Plan Share Options (Details) - 2014 Plan - Share options - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Share-based compensation    
Total fair value of shares that vested (in dollars) $ 1.6  
Options    
Outstanding at beginning of year (in shares) 1,812,766  
Granted (in shares) 508,500  
Forfeited (in shares) (40,371)  
Expired (in shares) (12,952)  
Outstanding at end of year (in shares) 2,267,943  
Fully vested and exercisable at end of year (in shares) 746,557  
Outstanding and expected to vest at end of year (in shares) 1,521,386  
Weighted average exercise price    
Outstanding at beginning of year (in euros/dollars per share) $ 12.47  
Granted (in dollars per share) 5.63  
Forfeited (in dollars per share) 12.76  
Expired (in dollars per share) 18.30  
Outstanding at end of year (in euros/dollars per share) 10.90  
Fully vested and exercisable at end of year (in dollars per share) 13.01  
Outstanding and expected to vest at end of year (in dollars per share) $ 9.86  
Weighted-average assumptions used to estimate fair value of share options granted during year    
Expected volatility (as a percent) 75.00% 75.00%
Expected terms (in years) 10 years 10 years
Risk free interest rate, minimum (as a percent) 2.53% 0.16%
Risk free interest rate, maximum (as a percent) 2.70% 0.54%
Expected dividend (as a percent) 0.00% 0.00%
Chief Executive Officer    
Options    
Granted (in shares) 175,000  
Non-executive directors    
Share-based compensation    
Vesting period 1 year  
Options    
Granted (in shares) 69,000