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STOCKHOLDERS' EQUITY - Public Offering of Common Stock - Additional Information (Details) - USD ($)
 9 Months Ended
Jul. 05, 2017
Jun. 17, 2016
Sep. 30, 2017
Sep. 30, 2016
Class Of Stock [Line Items]        
Proceeds from sale of common stock in public offering     $ 44,562,500 $ 57,499,995
Underwriting discounts and commissions and transaction costs     $ 2,944,168 $ 3,832,004
Public Offering        
Class Of Stock [Line Items]        
Shares of common stock issued 5,750,000 6,052,631    
Share price (in dollars per share) $ 7.75 $ 9.50    
Proceeds from sale of common stock in public offering $ 44,600,000 $ 57,500,000    
Underwriting discounts and commissions and transaction costs 3,000,000 3,800,000    
Net proceeds from issuance of common stock $ 41,600,000 $ 53,700,000    
Exercise of Underwriters        
Class Of Stock [Line Items]        
Shares of common stock issued 750,000