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Summary of Significant Accounting Policies - Reconciliation of Numerators and Denominators used in Computing Basic and Diluted Net Income Per Share (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Accounting Policies [Abstract]        
Net income (loss) $ (2,251,097) $ (2,132,303) $ (6,367,245) $ (3,906,437)
Numerator, basic and diluted net income (loss) available to stockholders $ (2,251,097) $ (2,132,303) $ (6,367,245) $ (3,906,437)
Shares used in computation - basic:        
Weighted average common shares outstanding 8,388,821 7,558,835 8,145,689 7,548,136
Common shares outstanding for basic 8,388,821 7,558,835 8,145,689 7,548,136
Shares used in computation - diluted:        
Common shares outstanding for basic 8,388,821 7,558,835 8,145,689 7,548,136
Shares used in computing diluted net income per share 8,388,821 7,558,835 8,145,689 7,548,136
Net (loss) per share - basic $ (0.27) $ (0.28) $ (0.78) $ (0.52)
Net (loss) per share - diluted $ (0.27) $ (0.28) $ (0.78) $ (0.52)