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Share-based compensation - Unvested Balance of Options (Detail) - $ / shares | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Number of units |  |  |
Unvested, Beginning balance (in shares) | 47,500 | 68,750 |
Vested (in shares) | (47,500) | (21,250) |
Unvested, Ending balance (in shares) | 0 | 47,500 | 68,750
Weighted average exercise price per share |  |  |
Unvested, Beginning balance (in dollars per share) | $ 8.96 | $ 8.91 |
Vested (in dollars per share) | 8.96 | 8.80 |
Unvested, Ending balance (in dollars per share) | $ 0.00 | $ 8.96 | $ 8.91
Weighted average remaining contractual term |  |  |
Unvested | 0 years | 7 years 10 months 24 days | 8 years 10 months 24 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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- 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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Period Type: | instant

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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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Data Type: | num:perShareItemType
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Period Type: | duration

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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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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

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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 Number of options vested. + References No definition available. + Details
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