Annual report pursuant to Section 13 and 15(d)

STOCKHOLDERS' EQUITY - Changes in Stock Options (Details)

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STOCKHOLDERS' EQUITY - Changes in Stock Options (Details) - USD ($)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Intrinsic value of stock options outstanding $ 0  
Options    
Number of Options    
Options outstanding, beginning 3,383,267  
Granted 780,000  
Cancelled 373,856  
Forfeited   273,275
Options outstanding, ending 3,516,316 3,383,267
Options Exercisable 2,574,703  
Options expected to vest 941,433  
Weighted Average Exercise Price    
Weighted average exercise price, beginning balance $ 4.25  
Granted 2.13  
Cancelled 5.80  
Forfeited   $ 5.24
Weighted average exercise price, ending balance 4.46 $ 4.25
Options Exercisable 4.67  
Options expected to vest 3.65  
Weighted average fair value of options granted during the period $ 0.89  
Weighted Average Remaining Life    
Weighted Average Remaining Life 6 years 9 months 18 days 7 years 1 month 10 days
Weighted Average Remaining Life, Granted 9 years 5 months 9 days  
Weighted Average Remaining Life, Options Exercisable 6 years 11 days  
Weighted Average Remaining Life, Options expected to vest 8 years 10 months 24 days