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Share-based compensation - 2014 Plan Share Options (Details)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended
Sep. 20, 2017
$ / shares
shares
Sep. 30, 2017
€ / shares
$ / shares
shares
Sep. 30, 2017
$ / shares
shares
Sep. 30, 2016
Sep. 30, 2017
€ / shares
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
Weighted average exercise price              
Outstanding at beginning of year (in euros/dollars per share) | € / shares         € 5.13    
Forfeited (in euros/dollars per share) | € / shares         3.07    
Expired (in euros/dollars per share) | € / shares         3.07    
Exercised (in euros/dollars per share) | € / shares         3.07    
Outstanding at end of year (in euros/dollars per share) | € / shares   € 8.52     € 8.52    
Weighted-average assumptions used to estimate fair value of share options granted during year              
Expected volatility (as a percent)   80.00% 80.00% 75.00%     75.00%
Expected terms (in years)   10 years 10 years 10 years   10 years 10 years
Risk free interest rate, minimum (as a percent)   2.40% 2.40% 1.52%   2.40% 0.16%
Risk free interest rate, maximum (as a percent)   2.48% 2.48% 1.89%   2.81% 1.96%
Expected dividend (as a percent)   0.00% 0.00% 0.00%   0.00% 0.00%
Minimum              
Weighted-average assumptions used to estimate fair value of share options granted during year              
Expected volatility (as a percent)           75.00%  
Maximum              
Weighted-average assumptions used to estimate fair value of share options granted during year              
Expected volatility (as a percent)           80.00%  
2014 Plan | Share options              
Options              
Outstanding at beginning of year (in shares) | shares           1,812,766  
Granted (in shares) | shares 150,000         949,350  
Forfeited (in shares) | shares           (348,697)  
Expired (in shares) | shares           (164,106)  
Exercised (in shares) | shares           (8,125)  
Outstanding at end of year (in shares) | shares   2,241,188 2,241,188     2,241,188  
Fully vested and exercisable at end of year (in shares) | shares   820,522 820,522   820,522 820,522  
Outstanding and expected to vest at end of year (in shares) | shares   1,420,666 1,420,666   1,420,666 1,420,666  
Weighted average exercise price              
Outstanding at beginning of year (in euros/dollars per share) | $ / shares           $ 12.47  
Granted (in dollars per share) | $ / shares $ 8.49         6.17  
Forfeited (in euros/dollars per share) | $ / shares           7.95  
Expired (in euros/dollars per share) | $ / shares           14.46  
Exercised (in euros/dollars per share) | $ / shares           7.49  
Outstanding at end of year (in euros/dollars per share) | $ / shares     $ 10.38     10.38  
Fully vested and exercisable at end of year (in dollars per share) | $ / shares   € 12.58 $ 12.58   € 12.58 12.58  
Outstanding and expected to vest at end of year (in dollars per share) | $ / shares           $ 9.10  
Total weighted average grant date fair value of options issued during the period (in $ million) | $           $ 3.5  
2014 Plan | Non-executive directors | Share options              
Weighted average exercise price              
Vesting period           1 year  
2014 Plan | Directors and Officers | Share options              
Options              
Granted (in shares) | shares           641,250  
Weighted average exercise price              
Granted (in dollars per share) | $ / shares           $ 6.43