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CONVERTIBLE NOTES (Narrative) (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Repayments of Convertible Debt $ 4,752,000 $ 10,961,000
Debt Conversion, Converted Instrument, Amount $ 2,137,000 $ 3,503,000
2013 Notes [Member]    
Debt Conversion, Converted Instrument, Shares Issued 2,613,636  
Repayments of Convertible Debt $ 2,200,000  
Debt Conversion, Converted Instrument, Amount $ 3,420,000  
Debt Instrument, Interest Rate, Stated Percentage 4.50%  
2016 Notes [Member]    
Debt Conversion, Converted Instrument, Shares Issued 1,338,707  
Repayments of Convertible Debt $ 11,668  
Long-term Debt, Gross 58,100,000  
Debt Conversion, Original Debt, Amount 1,000,000  
Repayments of Remaining Convertible Debt Through Necessary Funds $ 2,500,000  
Debt Instrument, Interest Rate, Stated Percentage 7.50%