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Share-based compensation - 2014 Plan Share Options (Details) - 2014 Plan - Share options
$ / shares in Units, $ in Thousands
12 Months Ended
Jan. 09, 2014
Dec. 31, 2016
USD ($)
item
$ / shares
shares
Dec. 31, 2015
USD ($)
item
$ / shares
shares
Dec. 31, 2014
item
$ / shares
shares
Share-based compensation        
Vesting period 4 years      
Options        
Outstanding at beginning of year (in shares) | shares   1,448,226    
Granted (in shares) | shares   899,178 566,500 1,115,000
Exercised (in shares) | shares   (87,425) (92,932)  
Forfeited (in shares) | shares   (407,577)    
Expired (in shares) | shares   (39,636)    
Outstanding at end of year (in shares) | shares   1,812,766 1,448,226  
Fully vested and exercisable at end of year (in shares) | shares   640,389    
Outstanding and expected to vest at end of year (in shares) | shares   1,172,377    
Weighted average exercise price        
Outstanding at beginning of year (in euros/dollars per share)   $ 14.05    
Granted (in dollars per share)   11.44    
Exercised (in euros per share)   9.36    
Forfeited (in dollars per share)   16.50    
Expired (in dollars per share)   12.26    
Outstanding at end of year (in euros/dollars per share)   12.47 $ 14.05  
Fully vested and exercisable at end of year (in dollars per share)   12.57    
Outstanding and expected to vest at end of year (in dollars per share)   $ 12.41    
Weighted average remaining contractual life (in years)        
Outstanding   7 years 11 months 1 day 8 years 2 months 9 days  
Fully vested and exercisable at end of year   6 years 3 months 22 days    
Outstanding and expected to vest at end of year   8 years 9 months 22 days    
Aggregate intrinsic value        
Outstanding (in dollars) | $     $ 6,522  
Exercised (in dollars) | $   $ 345 $ 1,697  
Weighted average grant-date fair value        
Granted (in dollars per share)   $ 6.54 $ 12.19 $ 5.36
Weighted-average assumptions used to estimate fair value of share options granted during year        
Expected volatility (as a percent)   75.00% 75.00% 70.00%
Expected terms (in years)   10 years   6 years 1 month 10 days
Risk free interest rate (as a percent)       0.23%
Risk free interest rate, minimum (as a percent)   0.16% 0.57%  
Risk free interest rate, maximum (as a percent)   2.67% 0.62%  
Expected dividend (as a percent)   0.00% 0.00% 0.00%
Number of publicly traded entities reference to | item   4 4 4
Maximum        
Weighted-average assumptions used to estimate fair value of share options granted during year        
Expected terms (in years)     10 years  
Minimum        
Weighted-average assumptions used to estimate fair value of share options granted during year        
Expected terms (in years)     6 years 1 month 10 days  
Non-executive directors        
Share-based compensation        
Vesting period 1 year      
One year from grant date        
Share-based compensation        
Vesting period 1 year      
Vesting percentage 25.00%      
Years two, three and four        
Share-based compensation        
Vesting period 4 years