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FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 1,463  
Warrant liabilities (2,928) $ (3,376)
Convertible debentures (16,668)  
Financial instruments fair value (18,133)  
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,463  
Warrant liabilities (2,813)  
Convertible debentures (16,668)  
Financial instruments fair value (18,018)  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0  
Warrant liabilities (115)  
Convertible debentures 0  
Financial instruments fair value (115)  
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0  
Warrant liabilities 0  
Convertible debentures 0  
Financial instruments fair value $ 0