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Share-based payments - Schedule of Stock Options Activity (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]    
Number of options, Beginning Balance 462,000  
Number of options, Additions as a result of the reverse acquisition   407,000
Number of options, Granted 30,000 85,000
Number of options, Forfeited (40,000) (30,000)
Number of options, Expired (100,000)  
Number of options, Ending Balance 352,000 462,000
Options vested and expected to vest as of December 31, 2016 352,000  
Number of options, Options Exercisable 283,250  
Weighted average exercise price per share, Beginning Balance $ 9.52  
Weighted average exercise price per share, Additions as a result of the reverse acquisition   $ 9.21
Weighted average exercise price per share, Granted 5.04 10.39
Weighted average exercise price per share, Forfeited 8.45 7.85
Weighted average exercise price per share, Expired 6.02  
Weighted average exercise price per share, Ending Balance 10.25 $ 9.52
Options vested and expected to vest as of December 31, 2016 10.25  
Weighted average exercise price per share, Options Exercisable $ 10.56  
Outstanding as of December 31, 2015 4 years 4 months 24 days 5 years 3 months 18 days
Options vested and expected to vest as of December 31, 2016 4 years 4 months 24 days  
Weighted average remaining contractual term, Options exercisable 3 years 3 months 18 days  
Aggregate intrinsic value, Beginning Balance $ 0 $ 0
Aggregate intrinsic value, Ending Balance 0 $ 0
Aggregate intrinsic value, Options vested and expected to vest as of December 31, 2016 0  
Aggregate intrinsic value, Options exercisable as of December 31, 2016 $ 0