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Net Loss Per Share - Schedule of Computation of Basic and Diluted Net Loss Per Share (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Numerator:        
Net loss $ (3,110,382) $ (1,617,070) $ (7,689,164) $ (3,229,926)
Less: Accumulated dividends on preferred stock (44,713) (87,123) (163,069) (143,014)
Net loss attributed to common stockholders $ (3,155,095) $ (1,704,193) $ (7,852,233) $ (3,372,940)
Denominator:        
Weighted-average common shares outstanding, basic and diluted 12,245,701 6,911,189 9,596,423 6,911,189
Net loss per share attributed to common stockholders, basic and diluted $ (0.26) $ (0.25) $ 0.82 $ (0.49)