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Share-based payments - Unvested Balance of Options (Detail) - $ / shares | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015
Number of options |  |
Unvested as of December 31, 2015 | 126,667 |
Granted | 30,000 |
Vested | (36,250) |
Forfeited | (30,000) |
Unvested as of September 30, 2016 | 90,417 | 126,667
Weighted average exercise price per share |  |
Unvested as of December 31, 2015 | $ 9.02 |
Granted | 5.04 |
Vested | 6.37 |
Forfeited | 9.59 |
Unvested as of September 30, 2016 | $ 8.57 | $ 9.02
Weighted average remaining contractual term |  |
Unvested | 9 years 2 months 12 days | 8 years 1 month 6 days

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- Definition Share Based Compensation Arrangement By Share Based Payment Award Options Nonvested Weighted Average Remaining Contractual Term + 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 The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + 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 (d)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number 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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