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Share-based compensation - 2014 Plan Share Options (Details) $ / shares in Units, $ in Millions |  | 3 Months Ended | 9 Months Ended
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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 |

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