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Share-based compensation - 2014 Plan Share Options (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Share-based compensation        
Total fair value of shares that vested (in dollars)     $ 0.5  
2014 Plan | Share options        
Share-based compensation        
Total fair value of shares that vested (in dollars)     $ 2.3  
Options        
Outstanding at beginning of year (in shares)     1,812,766  
Granted (in shares)     714,600  
Forfeited (in shares)     (118,739)  
Expired (in shares)     (55,764)  
Outstanding at end of year (in shares) 2,352,863   2,352,863  
Fully vested and exercisable at end of year (in shares) 816,586   816,586  
Outstanding and expected to vest at end of year (in shares) 1,536,277   1,536,277  
Weighted average exercise price        
Outstanding at beginning of year (in euros/dollars per share)     $ 12.47  
Granted (in dollars per share)     5.59  
Forfeited (in dollars per share)     9.76  
Expired (in dollars per share)     15.42  
Outstanding at end of year (in euros/dollars per share) $ 10.45   10.45  
Fully vested and exercisable at end of year (in dollars per share) $ 12.93   12.93  
Outstanding and expected to vest at end of year (in dollars per share)     $ 9.12  
Weighted-average assumptions used to estimate fair value of share options granted during year        
Expected volatility (as a percent) 75.00% 75.00% 75.00% 75.00%
Expected terms (in years) 10 years 10 years 10 years 10 years
Risk free interest rate (as a percent) 2.43%      
Risk free interest rate, minimum (as a percent)   1.58% 2.43% 0.16%
Risk free interest rate, maximum (as a percent)   1.96% 2.81% 1.96%
Expected dividend (as a percent) 0.00% 0.00% 0.00% 0.00%
2014 Plan | Chief Executive Officer | Share options        
Share-based compensation        
Vesting period     4 years  
Options        
Granted (in shares)     175,000  
2014 Plan | Non-executive directors | Share options        
Share-based compensation        
Vesting period     1 year  
Options        
Granted (in shares)     80,000