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STOCK OPTION EXERCISES (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2009
Dec. 31, 2008
STOCK OPTION EXERCISES          
Aggregate consideration from issue of common stock $ 283,933 $ 398,328 $ 536,925    
Non-qualified stock option          
STOCK OPTION EXERCISES          
Number of common stock issued on exercise of stock options (in shares) 272,477 418,195 584,450    
Aggregate consideration from issue of common stock $ 283,933 $ 398,328 $ 536,925    
Granted (in dollars per share)       $ 1.30 $ 0.81
Employees | Non-qualified stock option          
STOCK OPTION EXERCISES          
Number of common stock issued on exercise of stock options (in shares) 259,977 418,195 584,450    
Granted (in dollars per share)     $ 1.46