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Share-based compensation - Other Plans (Details) - Other plans - Share options
$ / shares in Units, $ in Millions
 3 Months Ended
Mar. 31, 2017
USD ($)
$ / shares
shares
Options  
Outstanding at beginning of year (in shares) 187,500
Granted (in shares) 150,000
Outstanding at end of year (in shares) 337,500
Fully vested and exercisable at end of year (in shares) 62,500
Outstanding and expected to vest at end of year (in shares) 275,000
Weighted average exercise price  
Outstanding at beginning of year (in euros/dollars per share) | $ / shares $ 17.93
Granted (in dollars per share) | $ / shares 5.31
Outstanding at end of year (in euros/dollars per share) | $ / shares 12.32
Fully vested and exercisable at end of year (in dollars per share) | $ / shares 27.82
Outstanding and expected to vest at end of year (in dollars per share) | $ / shares $ 8.80
Other disclosures  
Total fair value of shares that vested (in dollars) | $ $ 0.5
Exercised (in shares) 0