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NOTE 11 – STOCKHOLDERS’ EQUITY (Tables)
 9 Months Ended
Sep. 30, 2019
Equity [Abstract]  
The assumptions used in the Black-Scholes Model for options granted during the nine months ended September 30, 2019 and 2018 are set forth in the table below.

The assumptions used in the Black-Scholes Model for options granted during the nine months ended September 30, 2019 and 2018 are set forth in the table below.

 

 

Nine months ended

September 30,
  2019   2018
Risk-free interest rate 1.83-2.54%   2.78-2.82%
Volatility 61.25-64.49%   61.8-63.34%
Term (in years) 5.5-6.5   5.5-6.25
Dividend yield 0.00%   0.00%
A summary of activity under the 2009, 2012 and 2019 Plans and related information follows:

A summary of activity under the 2009, 2012 and 2019 Plans and related information follows:

 

    Number of Shares Underlying Stock Options     Weighted Average Exercise Price     Weighted
Average
Remaining
Contractual
Life in Years		     Aggregate Intrinsic Value  
Balance at December 31, 2018     20,872,824     $ 4.93       5.94 years     $ 12,239,876  
Granted     4,419,501     $ 3.13                  
Exercised     (343,716 )   $ 0.32             $ 1,426,828  
Expired/Forfeited     (98,625 )   $ 5.63                  
Balance at September 30, 2019     24,849,984     $ 4.67       6.05 years     $ 13,761,778  
Vested and Exercisable at September 30, 2019     17,601,027     $ 4.85       4.81 years     $ 9,745,527  
Unvested at September 30, 2019     7,248,957     $ 4.22       9.06 years     $ 4,016,251