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FAIR VALUE ACCOUNTING - Fair Value Measurements, Recurring and Nonrecurring (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments $ 1,909  
Warrant liabilities (3,153) $ (3,912)
Convertible debentures (15,962)  
Financial instruments fair value (17,206)  
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 1,909  
Warrant liabilities (2,538)  
Convertible debentures (15,962)  
Financial instruments fair value (16,591)  
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Investments 0  
Warrant liabilities (615)  
Convertible debentures 0  
Financial instruments fair value (615)  
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