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SALE OF COMMON STOCK (Details) - USD ($)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended 12 Months Ended
Feb. 28, 2018
Jan. 31, 2017
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Subsidiary, Sale of Stock [Line Items]          
Proceeds from issuance of common stock     $ 0 $ 19,766 $ 26,425
Private Placement          
Subsidiary, Sale of Stock [Line Items]          
Number of shares issued (in shares) 9.5        
Price per share issued (in usd per share) $ 2.10        
Proceeds from issuance of common stock $ 20,000        
Common stock, shares issued (shares)   10.8      
Gross proceeds from issuance of common stock   $ 10,000