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Stockholders' equity - Schedule of Stock Option Transactions and Number of Stock Options Outstanding (Detail) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2016
Sep. 30, 2016
Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Options Outstanding, Number of Shares, beginning balance   865,457  
Options granted, Number of Shares   573,960  
Options exercised, Number of Shares (55,012) (55,663)  
Options expired, Number of Shares   (8,008)  
Options forfeited, Number of Shares   (82,144)  
Options Outstanding, Number of Shares, ending balance 1,293,602 1,293,602 865,457
Exercisable, Number of Shares, ending balance 526,197 526,197  
Options Outstanding, Weighted Average Exercise Price, beginning balance   $ 9.75  
Options granted, Weighted Average Exercise Price   8.33  
Options exercised, Weighted Average Exercise Price   7.91  
Options expired, Weighted Average Exercise Price   9.52  
Options forfeited, Weighted Average Exercise Price   9.39  
Options Outstanding, Weighted Average Exercise Price, ending balance $ 9.22 9.22 $ 9.75
Exercisable, Weighted Average Exercise Price, ending balance $ 9.19 $ 9.19  
Options Outstanding, Weighted Average Remaining Contractual Life (Years), beginning balance   7 years 11 months 1 day 7 years 6 months 22 days
Exercisable, Weighted Average Remaining Contractual Life (Years), ending balance   6 years 3 months 7 days  
Options Outstanding, Aggregate Intrinsic Value $ 5,355 $ 5,355 $ 2,393
Exercisable, Aggregate Intrinsic Value $ 2,195 $ 2,195