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STOCK OPTIONS - SUMMARY OF STOCK OPTIONS (Details) - $ / shares
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]    
Outstanding, beginning of period (in shares) 3,131,447 2,864,189
Granted (in shares) 810,762 830,922
Exercised (in shares) (36,250) (97,500)
Cancelled and forfeited (in shares) (153,750) (466,164)
Outstanding, end of period (in shares) 3,752,209 3,131,447
Exercisable, end of period (in shares) 2,006,702  
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]    
Outstanding, beginning of period (in dollars per share) $ 3.38 $ 3.69
Granted (in dollars per share) 1.87 2.21
Exercised (in dollars per share) 3.62 2.25
Cancelled and forfeited (in dollars per share) 3.69 3.57
Outstanding, end of period (in dollars per share) 3.04 $ 3.38
Exercisable, end of period (in dollars per share) $ 3.79