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Going Concern - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2017
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Going Concern [Line Items]            
Net loss   $ (3,110,382) $ (1,617,070) $ (7,689,164) $ (3,229,926)  
Cash used to fund operations       (11,149,228) $ (2,966,800)  
Accumulated deficit   $ (38,948,613)   $ (38,948,613)   $ (31,259,449)
Private Placement [Member] | 6% Convertible Notes [Member]            
Going Concern [Line Items]            
Note Agreement, amount $ 8,600,000          
Convertible notes, interest rate 6.00%