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Stock Option Plans (Additional Information) (Detail)
9 Months Ended
Sep. 30, 2015
USD ($)
$ / shares
shares
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Weighted average remaining contractual term on unvested options 7 years
Exercisable Options Outstanding Shares 397,148
Weighted average exercise price per share | $ / shares $ 6.09
Unvested Options Outstanding, Shares 525,468
Unvested Options Outstanding, Weighted average exercise price | $ / shares $ 3.83
Unvested Options Outstanding Weighted average remaining life (yrs) 9 years 6 months
Unrecognized stock compensation expense | $ $ 1,833,333
Weighted average recognition period 2 years 1 month 6 days
Equity Option [Member]  
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]  
Stock Issued During Period, Shares, Conversion of Convertible Securities 8,456
Share-Based Compensation Arrangement By Share-Based Payment Award, Options, Exercises In Period 15,833