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ACCRUED EXPENSES AND OTHER CURRENT LIABILITIES (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Dec. 31, 2019
Jan. 29, 2019
Jan. 15, 2019
Reduction in Certain Accrued Expense and Accounts Payable $ 0 $ 200      
Common stock warrant liabilities $ 402   $ 1,338    
Gain (loss) on settlement of equity instruments   167      
Proceeds from convertible notes   $ 250      
Crede Note          
Issuance of convertible notes         $ 1,450
Settled Litigation | Leviston Resources LLC          
Issuance of convertible notes       $ 700