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Share-based compensation - Other Plans (Details) - Other plans - Share options $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 12 Months Ended
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Jan. 31, 2015 | Oct. 01, 2014 | Sep. 30, 2016 shares | Jan. 31, 2014 € / shares shares | Dec. 31, 2016 € / shares $ / shares shares | Dec. 31, 2016 USD ($) $ / shares shares | Dec. 31, 2015 USD ($) € / shares | Dec. 31, 2015 USD ($) $ / shares shares | Dec. 31, 2014 € / shares | Dec. 31, 2014 USD ($) shares
Options |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year (in shares) |  |  |  |  |  | 1,152,436 |  |  |  |
Granted (in shares) |  |  |  |  |  | 125,000 |  | 1,000,000 |  | 609,744
Exercised (in shares) |  |  |  |  |  | (152,436) |  | (304,872) |  | (152,436)
Forfeited (in shares) |  |  |  |  |  | (937,500) |  |  |  |
Outstanding at end of year (in shares) |  |  |  |  |  | 187,500 |  | 1,152,436 |  |
Fully vested and exercisable at end of year (in shares) |  |  |  |  | 62,500 | 62,500 |  |  |  |
Outstanding and expected to vest at end of year (in shares) |  |  |  |  | 125,000 | 125,000 |  |  |  |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |
Outstanding at beginning of year (in euros/dollars per share) | (per share) |  |  |  |  | € 0.05 | $ 18.36 |  |  |  |
Granted (in dollars per share) | $ / shares |  |  |  |  |  | 12.98 |  |  |  |
Exercised (in euros per share) | € / shares |  |  |  |  | € 0.05 |  |  |  |  |
Forfeited (in dollars per share) | $ / shares |  |  |  |  |  | 17.73 |  |  |  |
Outstanding at end of year (in euros/dollars per share) | (per share) |  |  |  |  |  | 17.93 | € 0.05 | $ 18.36 |  |
Fully vested and exercisable at end of year (in dollars per share) | $ / shares |  |  |  |  | € 27.82 | 27.82 |  |  |  |
Outstanding and expected to vest at end of year (in dollars per share) | $ / shares |  |  |  |  |  | $ 12.98 |  |  |  |
Weighted average remaining contractual life (in years) |  |  |  |  |  |  |  |  |  |
Outstanding |  |  |  |  |  | 6 years 4 months 21 days |  | 8 years 8 months 16 days |  |
Fully vested and exercisable at end of year |  |  |  |  |  | 6 months |  |  |  |
Outstanding and expected to vest at end of year |  |  |  |  |  | 9 years 3 months 29 days |  |  |  |
Aggregate intrinsic value |  |  |  |  |  |  |  |  |  |
Outstanding (in dollars) | $ |  |  |  |  |  |  | € 2,513 | $ 2,513 |  |
Exercised (in dollars) | $ |  |  |  |  |  | $ 2,694 |  | $ 6,155 |  | $ 2,459
Weighted average grant-date fair value |  |  |  |  |  |  |  |  |  |
Granted (in dollars per share) | (per share) |  |  |  |  |  | $ 7.63 |  | $ 10.60 | € 12.55 |
Chief Executive Officer |  |  |  |  |  |  |  |  |  |
Options |  |  |  |  |  |  |  |  |  |
Forfeited (in shares) |  |  | (800,000) |  |  |  |  |  |  |
4D |  |  |  |  |  |  |  |  |  |
Options |  |  |  |  |  |  |  |  |  |
Granted (in shares) |  |  |  | 609,744 |  |  |  |  |  |
Weighted average exercise price |  |  |  |  |  |  |  |  |  |
Exercised (in euros per share) | € / shares |  |  |  | € 0.05 |  |  |  |  |  |
Other disclosures |  |  |  |  |  |  |  |  |  |
Vesting percentage | 50.00% | 25.00% |  |  |  |  |  |  |  |

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- Definition Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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