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STOCKHOLDERS' EQUITY (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Schedule of warrant activity

Summary of our Warrant activity during the year ended December 31, 2015:

 

    Number of
Shares
Under
Warrants		     Weighted
Average
Exercise
Price		     Weighted
Average
Remaining
Contractual
Life in Years		     Aggregate
Intrinsic
Value		  
Balance at December 31, 2014     13,927,916     $ 1.82       3.0     $ 36,623,875  
   Granted     50,000     $ 6.35                  
   Exercised     (1,255,485 )   $ 0.79             $ 7,282,404  
   Expired     —                          
   Cancelled/Forfeited     —                          
Balance at December 31, 2015     12,722,431     $ 1.93       1.7     $ 107,344,752  
Vested and Exercisable at December 31, 2015     12,422,432     $ 1.92       1.6     $ 104,909,091  

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

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, 2015, 2014 and 2013 are set forth in the table below.

 

  2015   2014   2013
Weighted average fair value $6.35   n/a   $2.83
Risk-free interest rate 1.02%   n/a   0.88-1.12%
Volatility 60.59%   n/a   44.29-45.89%
Term (in years) 5   n/a   5-6
Dividend yield 0.00%   n/a   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, 2015, 2014 and 2013 are set forth in the table below.

 

  2015   2014   2013
Risk-free interest rate 1.47-1.67%   0.07-1.77%   0.65-1.71%
Volatility 58.78-62.94%   68.05-82.29%   33.35-45.76%
Term (in years) 5.27-6.25   5-6.25   5-6.25
Dividend yield 0.00%   0.00%   0.00%
Schedule of plan activity

A summary of activity under the 2009 and 2012 Plans and related information during the year ended December 31, 2015 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, 2014     16,792,443     $ 1.88       6.9     $ 43,996,311  
   Granted     4,685,000     $ 8.14                  
   Exercised     (613,284 )   $ 2.01                  
   Expired     (102,500 )   $ 2.68                  
   Cancelled/Forfeited     (36,334 )   $ 4.02                  
Balance at December 31, 2015     20,725,325     $ 3.28       6.5     $ 146,864,184  
Vested and Exercisable at December 31, 2015     15,461,986     $ 1.86       5.5     $ 131,523,505  
Unvested at December 31, 2015     5,263,339     $ 7.46       9.4     $ 15,340,679