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Share based compensation - Share Options Activities (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) shares | Dec. 31, 2016 USD ($) shares
Disclosure Of Share-Based Payment Arrangements [Abstract] |  |
Number of share options outstanding, beginning balance (in shares) | shares | 963,789 | 1,144,534
Number of share options granted (in shares) | shares | 386,614 | 107,660
Number of share options exercised (in shares) | shares | (172,501) | (132,599)
Number of accrued dividend awards (in shares) | shares | 12,258 | 12,572
Number of share options lapsed (in shares) | shares | (7,845) | (168,378)
Number of share options outstanding, ending balance (in shares) | shares | 1,182,315 | 963,789
Weighted average exercise price of share options outstanding, beginning balance (in USD per share) | $ | $ 8.51 | $ 7.26
Weighted average exercise price of share options granted (in USD per share) | $ | 0.65 | 0.67
Weighted average exercise price of share options exercised (in USD per share) | $ | (5.03) | (0.67)
Weighted average exercise price of accrued dividend awards (in USD per share) | $ | 0.65 | 0.67
Weighted average exercise price of share options lapsed (in USD per share) | $ | (0.65) | (0.67)
Weighted average exercise price of share options outstanding, ending balance (in USD per share) | $ | $ 6.42 | $ 8.51

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- Definition The number of share options outstanding in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph d -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_d&doctype=Standard -URIDate 2017-03-09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause i -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_i&doctype=Standard -URIDate 2017-03-09 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause vi -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_vi&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of share options exercised in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause iv -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iv&doctype=Standard -URIDate 2017-03-09 + Details
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- Definition The number of share options forfeited in a share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 2 -IssueDate 2017-01-01 -Paragraph 45 -Subparagraph b -Clause iii -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=2&date=2017-03-01&anchor=para_45_b_iii&doctype=Standard -URIDate 2017-03-09 + Details
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