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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2017
Stockholders' Equity:  
Schedule of warrant activity

Summary of our Warrant activity during the year ended December 31, 2017:

 

   Number of
Shares Under Warrants		   Weighted
Average
Exercise Price		   Weighted
Average
Remaining
Contractual
Life in Years		   Aggregate
Intrinsic
Value		 
Balance at December 31, 2016   12,060,071   $2.08    1.0   $45,063,867 
Granted   125,000   $6.83           
Exercised   (9,066,666)  $1.98        $48,535,969 
Expired   (2,500)  $2.64           
Cancelled/Forfeited   —   $—           
Balance at December 31, 2017   3,115,905   $2.58    1.8   $11,348,273 
Vested and Exercisable at December 31, 2017   2,792,983   $2.64    0.8   $1,141,836 
Unvested at December 31, 2017   322,922   $2.57    2.0   $10,206,436 

 
Schedule of assumptions used in the Black-Scholes Model of warrants issued

The weighted average fair value per share of warrants issued and the assumptions used in the Black-Scholes Model during the years ended December 31, 2017, 2016 and 2015 are set forth in the table below.

 

   2017   2016   2015 
Weighted average exercise price  $6.83   $7.90   $6.35 
Weighted average grant date fair value  $3.67   $4.78   $3.27 
Risk-free interest rate   1.47%   1.04-1.28%   1.02%
Volatility   63.24%   74.10-74.15%   60.59%
Term (in years)   5    5    5 
Dividend yield   0.00%   0.00%   0.00%

 
Schedule of assumptions used in the Black-Scholes Model of stock options

The ranges of assumptions used in the Black-Scholes Model during the years ended December 31, 2017, 2016, and 2015 are set forth in the table below.

 

   2017   2016   2015 
Weighted average exercise price  $6.60   $6.22   $8.14 
Weighted average grant date fair value  $3.82   $3.94   $4.45 
Risk-free interest rate   1.84-2.05%   1.13-1.90%   1.47-1.67%
Volatility   61.56-64.25%   70.26-73.34%   58.78-62.94%
Term (in years)   5.5-6.25    5.5-6.25    5.27-6.25 
Dividend yield   0.00%   0.00%   0.00%

 
Schedule of 2009 and 2012 Plans activity

A summary of activity under the 2009 and 2012 Plans and related information during the year ended December 31, 2017 is as follows:

 

   Number of
Shares Under
Options		   Weighted
Average
Exercise Price		   Weighted
Average
Remaining
Contractual
Life in Years		   Aggregate
Intrinsic
Value		 
Balance at December 31, 2016   21,767,854   $3.56    5.8   $60,495,730 
Granted   2,271,500   $6.60           
Exercised   (102,546)  $2.07        $452,287 
Expired   (108,375)  $7.64           
Cancelled/Forfeited   (463,208)  $6.28           
Balance at December 31, 2017   23,365,225   $3.78    5.13   $64,664,821 
Vested and Exercisable at December 31, 2017   19,770,142   $3.27    4.47   $63,895,512 
Unvested at December 31, 2017   3,595,083   $6.60    8.79   $769,309