Quarterly report pursuant to Section 13 or 15(d)

10. STOCK-BASED COMPENSATION (Tables)

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10. STOCK-BASED COMPENSATION (Tables)
6 Months Ended
Jun. 30, 2016
Options [Member]  
Stock Option Activity
    Number of Shares     Weighted Average Exercise Price     Weighted Average Remaining Contract Term (Years)     Aggregate Intrinsic Value  
Outstanding - December 31, 2015     9,799,036     $ 1.97       9.20     $ 57,800  
Granted     1,210,000       0.42              
Forfeited     (13,015 )     0.73              
Expired     (76,036 )     2.82              
Outstanding - June 30, 2016     10,919,985       1.80       8.84       200,200  
                                 
Total exercisable - June 30, 2016     7,616,746       2.10       8.66       140,450  
Total unvested - June 30, 2016     3,303,239       1.10       9.26       59,750  
Total vested or expected to vest - June 30, 2016     10,919,985       1.80       8.84       200,200  
Unvested Stock Options [Member]  
Stock Option Activity
      Number of Shares     Weighted Average Fair Value Per Share on Grant Date  
  Unvested stock options - December 31, 2015        2,511,055     $ 1.37  
  Granted        1,210,000       0.31  
  Vested        (404,801 )     1.97  
  Cancellations        (13,015 )     0.54  
  Unvested stock options - June 30, 2016        3,303,239       0.91