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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

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

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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

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Weighted average grant-date fair value of non-vested options forfeited.

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