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STOCKHOLDERS' EQUITY (Tables)
 6 Months Ended
Jun. 30, 2018
Stockholders' Equity:  
Schedule of assumptions used in the Black-Scholes Model of stock options

The assumptions used in the Black-Scholes Model for options granted during the six months ended June 30, 2018 and 2017 are set forth in the table below. 

 

    Six Months
Ended
June 30,
2018		   Six Months
Ended
June 30,
2017
Risk-free interest rate     2.38-2.63%       1.84-2.01%  
Volatility     61.82-64.04%       61.56-63.95%  
Term (in years)     5.1-6.25       5.5-6.25  
Dividend yield     0.00 %     0.00 %
Schedule of 2009 and 2012 Plans activity

A summary of activity under the 2009 and 2012 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, 2017     23,365,225     $ 3.78       5.13     $ 64,664,821  
Granted     2,315,500     $ 5.26                  
Exercised     (404,576 )   $ 2.79             $ 1,386,827  
Expired/Forfeited     (62,250 )   $ 7.61                  
Balance at June 30, 2018     25,210,899     $ 3.92       5.16     $ 69,013,547  
Vested and Exercisable at                                
June 30, 2018     20,565,025     $ 3.46       4.30     $ 66,096,342  
Unvested at June 30, 2018     4,645,874     $ 5.98       8.96     $ 2,917,204