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

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

+ References

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- Definition

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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Number of non-vested options outstanding.

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

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