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STOCKHOLDERS' EQUITY (Tables)
12 Months Ended
Dec. 31, 2013
Equity [Abstract]  
Schedule of warrant activity

Summary of our Warrant activity and related information for 2011-2013

  

    Number of Shares Under Warrants     Weighted Average Exercise Price     Weighted Average Remaining Contractual Life in Years     Aggregate Intrinsic Value  
Balance at December 31, 2010                              
Issued     3,057,627     $ 0.36       7.9     $ 3,483,691  
Exercised                              
Expired                              
Cancelled                              
Balance at December 31, 2011     3,057,627     $ 0.36       7.9     $ 3,483,691  
Issued     17,332,500     $ 1.26       4.3     $ 31,891,150  
Exercised     (8,145,486 )   $ 0.38                  
Expired                              
Cancelled     (51,142 )   $ 0.24                  
Balance at December 31, 2012     12,193,499     $ 1.63             $ 17,971,994  
Issued     2,100,000     $ 2.72       4.8     $ 5,232,500  
Exercised                              
Expired                              
Cancelled                              
Balance at December 31, 2013     14,293,499     $ 1.79       3.9     $ 48,932,777  
Vested and Exercisable at December 31, 2013     13,764,710     $ 1.81       3.9     $ 46,840,559  

Schedule of weighted average fair value per share and assumptions used in the Black-Scholes Model of warants

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, 2013, 2012 and 2011 are set forth in the table below.

 

    2013     2012     2011  
Weighted average fair value   $ 2.83     $ 2.05     $ 0.16  
Risk-free interest rate     0.88-1.12 %     0.72-1.04 %     0.91-3.48 %
Volatility     44.29-45.89 %     44.64-44.81 %     39.13-51.83 %
Term (in years)     5-6       5       5-10  
Dividend yield     0.00 %     0.00 %     0.00 %
Schedule of assumptions used in the Black-Scholes Model of stock options

The assumptions used in the Black-Scholes Model during the years ended December 31, 2013 are set forth in the table below.

 

   2013   2012   2011 
Risk-free interest rate   0.65-1.71%   0.61-2.23%   0.91-2.54%
Volatility   33.35-45.76%   40.77-46.01%   37.92-40.48%
Term (in years)   5-6.25    5-6.25    5.5-6.25 
Dividend yield   0.00%   0.00%   0.00%

 

Schedule of Option activity

 

A summary of activity under the 2009 and 2012 Plans and related information for 2011-2013 follows:

 

    Number of Shares Under Options     Weighted Average Exercise Price     Weighted Average Remaining Contractual Life in Years     Aggregate Intrinsic Value  
                                 
Balance at December 31, 2010                              
Granted(1)     10,682,218     $ 0.16       7.6     $ 14,188,484  
Exercised     (92,057 )   $ 0.19                  
Expired                              
Cancelled                              
Balance at December 31, 2011     10,590,161     $ 0.16       7.6     $ 14,067,649  
Granted     5,121,250     $ 2.80       9.7     $ 1,737,530  
Exercised     (1,931,788 )   $ 0.13                  
Expired                              
Cancelled     (46,135 )                        
Balance at December 31, 2012     13,733,488     $ 1.16       7.7     $ 26,804,117  
Granted     2,583,677     $ 3.31       9.8     $ 4,920,981  
Exercised     (75,423 )                        
Expired     (250 )                        
Cancelled     (608,750 )                        
Balance at December 31, 2013     15,632,742     $ 1.44       7.2     $ 58,878,132  
Vested and Exercisable at December 31, 2013     11,282,627     $ .80       6.5     $ 48,321,930  

 

 

(1)This includes (i) VitaMed Options granted between October 2008 and December 31, 2010 for an aggregate of 7,639,722 Units, of which 16,000 were canceled prior to conversion (or Options for 9,357,561 shares per the Conversion Ratio), (ii) VitaMed Options granted between January 1, 2011 and October 3, 2011 for an aggregate of 621,000 Units (or Options for 762,235 shares per the Conversion Ratio) and (iii) Options granted between October 4, 2011 and December 31, 2011 for an aggregate of 562,422 shares. The terms and conditions of the VitaMed Options were reflected in the replacement Options including the number of shares vested.