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FAIR VALUE ACCOUNTING - Warrants and Debentures (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 1,107  
Warrant liabilities (6,283)  
Convertible debentures (15,880) $ (16,636)
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,107 903
Warrant liabilities (5,621)  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0  
Warrant liabilities 0  
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0  
Warrant liabilities $ (662) (385)
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   1,937
Warrant liabilities   (3,376)
Convertible debentures   (16,636)
Investments, warrants and convertible debentures   (18,075)
Fair Value, Measurements, Recurring | Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   1,937
Warrant liabilities   (2,991)
Convertible debentures   (16,636)
Investments, warrants and convertible debentures   (17,690)
Fair Value, Measurements, Recurring | Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0
Warrant liabilities   0
Convertible debentures   0
Investments, warrants and convertible debentures   0
Fair Value, Measurements, Recurring | Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments   0
Warrant liabilities   (385)
Convertible debentures   0
Investments, warrants and convertible debentures   $ (385)