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Share-based payments - Unvested Balance of Options (Detail) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 | Dec. 31, 2016
Number of options |  |
Unvested as of December 31, 2016 | 68,750 |
Vested | (11,250) |
Unvested as of September 30, 2017 | 57,500 | 68,750
Weighted average exercise price per share |  |
Unvested as of December 31, 2016 | $ 8.91 |
Vested | 7.44 |
Unvested as of September 30, 2017 | $ 9.19 | $ 8.91
Weighted average remaining contractual term |  |
Unvested | 8 years 2 months 12 days | 8 years 10 months 25 days

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- Definition Share-based compensation arrangement by share based payment award options non-vested weighted average remaining contractual term. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Number of non-vested options outstanding. + References No definition available. + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of non-vested options outstanding. + References No definition available. + Details
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- Definition Number of options vested. + References No definition available. + Details
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- Definition Weighted average grant-date fair value of options vested. + References No definition available. + Details
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