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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

Share-based compensation arrangement by share based payment award options non-vested weighted average remaining contractual term.

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Share-based compensation arrangement by share-based payment award options non-vested additions as result of reverse acquisition.

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Sharebased compensation arrangement by sharebased payment award options nonvested options additions as result of reverse acquisition weighted average exercise price per share.

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Sharebased compensation arrangement by sharebased payment award options nonvested weighted average exercise price per share.

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Sharebased compensation arrangement by sharebased payment award options nonvested weighted average exercise price per share.

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Gross number of share options (or share units) granted during the period.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Number of non-vested options outstanding.

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Number of non-vested options forfeited.

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Number of options vested.

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