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FAIR VALUE MEASUREMENT (Tables)
3 Months Ended
Mar. 31, 2018
2013 Notes and 2016 Notes [Member]  
Fair Value Measurements, Recurring and Nonrecurring
The
following parameters were used:
 
 
 
2013 Notes
 
 
2016 Notes
 
Stock price (USD)
 
 
0.5399
 
 
 
0.5399
 
Expected term (years)
 
 
0.46
 
 
 
3.63
 
Risk free rate
 
 
1.88
%
 
 
2.45
%
Volatility
 
 
62.44
%
 
 
70.96
%
Yield
 
 
12.89
%
 
 
12.44
%