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STOCKHOLDERS' EQUITY - Warrants Exercises - Additional Information (Details) - USD ($)
9 Months Ended 15 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Mar. 31, 2017
Class Of Warrant Or Right [Line Items]      
Proceeds from exercise of warrants $ 9,356,833 $ 22,222,494  
Private Placement | Warrants      
Class Of Warrant Or Right [Line Items]      
Common stock exercise price per share     $ 5.772
Shares of common stock to purchase by warrant     5,673,758
Proceeds from exercise of warrants     $ 32,700,000
Warrants outstanding 0