Quarterly report pursuant to Section 13 or 15(d)

STOCKHOLDERS' EQUITY - Warrant (Details)

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STOCKHOLDERS' EQUITY - Warrant (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Jun. 19, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 19, 2018
Dec. 31, 2017
Jul. 25, 2017
Jun. 30, 2017
Class of Warrant or Right [Line Items]                  
Common stock, par value (in dollars per share)   $ 0.0001   $ 0.0001     $ 0.0001    
Common stock, shares issued (in shares)   27,260,099   27,260,099     27,707,328    
Series A-1 warrant liability   $ 0 $ 3,313 $ 0 $ 3,313        
Change in fair value of warrant liability   $ (1,046) 1,530 $ (3,445) 1,530        
Common Stock Warrant                  
Class of Warrant or Right [Line Items]                  
Common stock, par value (in dollars per share) $ 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                
Term of warrant 3 years                
Series A-1 warrant liability $ 3,300                
Common stock | Common Stock Warrant | Soryn HLDR                  
Class of Warrant or Right [Line Items]                  
Common stock warrant purchased (in shares) 2,000,000 2,355,506   2,355,506          
Common stock, shares issued (in shares) 2,000,000             46,370 309,136
Series A-1 warrant liability           $ 4,500      
Change in fair value of warrant liability   $ (1,000) $ 1,500 $ (3,400) $ 1,500