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Share-based compensation - Unvested Balance of Options (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Number of options |  |  |
Unvested, Beginning balance | 68,750 | 126,667 |
Additions as a result of the reverse acquisition | shares |  |  | 63,334
Granted |  | 30,000 | 85,000
Vested | (21,250) | (47,917) | (11,667)
Forfeited |  | (40,000) | (10,000)
Unvested, Ending balance | 47,500 | 68,750 | 126,667
Weighted average exercise price per share |  |  |
Unvested, Beginning balance | $ 8.91 | $ 9.02 |
Additions as a result of the reverse acquisition |  |  | $ 6.82
Granted |  | 5.04 | 10.39
Vested | 8.80 | 7.16 | 8.10
Forfeited |  | 8.45 | 7.85
Unvested, Ending balance | $ 8.96 | $ 8.91 | $ 9.02
Weighted average remaining contractual term |  |  |
Unvested | 7 years 10 months 24 days | 8 years 10 months 24 days | 8 years 1 month 6 days

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- Definition Sharebased compensation arrangement by sharebased payment award options nonvested options additions as result of reverse acquisition weighted average exercise price per share. + References No definition available. + Details
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- Definition Sharebased compensation arrangement by sharebased payment award options nonvested weighted average exercise price per share. + References No definition available. + Details
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- Definition Sharebased compensation arrangement by sharebased payment award options nonvested weighted average exercise price per share. + References No definition available. + Details
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- Definition Sharebased compensation arrangement by sharebased payment award options vested weighted average exercise price per share. + References No definition available. + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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