Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Warrant (Details)

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STOCKHOLDERS' EQUITY - Warrant (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 19, 2017
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Jul. 25, 2017
Jun. 30, 2017
Jun. 29, 2017
Dec. 31, 2016
Class of Warrant or Right [Line Items]                  
Common stock, par value (in dollars per share)   $ 0.0001   $ 0.0001     $ 0.0001   $ 0.0001
Common stock, shares issued (in shares)   27,483,994   27,483,994         23,102,728
Series A-1 warrant liability $ 3,300,000 $ 3,313,000 $ 0 $ 3,313,000 $ 0        
Change in fair value of warrant liability   (1,530,000) $ 0 (1,530,000) $ 0        
Aggregate intrinsic value of the warrant   $ 0   $ 0          
Common Stock Warrant                  
Class of Warrant or Right [Line Items]                  
Common stock, par value (in dollars per share)   $ 0.0001   $ 0.0001          
Right to acquire variable amount of common stock, term 15 months                
Common Stock Warrant | Soryn HLDR                  
Class of Warrant or Right [Line Items]                  
Exercise price (in dollars per share) $ 3.18 $ 3.18   $ 3.18          
Term of warrant 3 years     3 years          
Common stock | Common Stock Warrant | Soryn HLDR                  
Class of Warrant or Right [Line Items]                  
Common stock warrant purchased (in shares) 2,355,506           2,300,000 2,000,000  
Common stock, shares issued (in shares) 2,000,000         46,370 309,136    
Series A-1 warrant liability   $ 1,800,000   $ 1,800,000          
Change in fair value of warrant liability   $ 1,500,000