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Organization, Liquidity and Management's Plan, and Summary of Significant Accounting Policies - Schedule of Computation of Basic and Diluted Net Loss per Common Share (Detail) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Numerator        
Net loss attributable to common stockholders $ (3,807,431) $ (4,736,544) $ (11,087,213) $ (18,313,025)
Denominator        
Weighted-average common shares outstanding 19,482,162 9,783,312 15,590,113 8,120,639
Less: Weighted-average shares subject to repurchase (490,191) (835,832) (537,974) (1,318,470)
Denominator for basic and diluted net loss per share 18,991,971 8,947,480 15,052,139 6,802,169
Basic and diluted net loss per share $ (0.20) $ (0.53) $ (0.74) $ (2.69)