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WARRANTS (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Jan. 23, 2018
Dec. 31, 2017
Common stock, par value (in dollars per share) $ 0.01     $ 0.01
Warrant contra revenue $ (2,500) $ 0    
Amazon Transaction Agreement | Warrant        
Common stock, par value (in dollars per share)     $ 0.01  
Class of Warrant or Right, Exercise Price of Warrants or Rights     $ 9.96  
Warrant contra revenue $ 2,500      
Amazon Transaction Agreement | Warrant | Maximum        
Class of Warrant or Right, Outstanding     4,000,000  
Warrants and Rights Outstanding     $ 600,000  
Amazon Transaction Agreement | Warrant | Tranche 1 [Member]        
Class of Warrant or Right, Outstanding     425,532  
Amazon Transaction Agreement | Warrant | Initial Tranche [Member]        
Class of Warrant or Right, Outstanding 425,532