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STOCK OPTIONS (Tables)
 12 Months Ended
Dec. 31, 2013
STOCK OPTIONS  
Schedule of assumptions used principally in determining the fair value of options granted

 

 

 
   December 31,
 
   2013   2012   2011

Risk-free interest rate

   0.77 - 2.52%   0.62 - 1.23%   0.97 - 3.05%

Expected dividend yield

   0%   0%   0%

Expected term (employee grants)

   6.25   6.25   6.25

Expected volatility

   102%   75%   49%
Summary of option activity

 

 

Options
  Shares   Weighted
Average
Exercise
Price		   Weighted
Average
Remaining
Contractual
Term in
Years		   Aggregate
Intrinsic
Value		  

Outstanding at December 31, 2012

     8,648,268   $ 1.29              

Granted

     3,035,000   $ 2.23              

Forfeited

     (2,902,584 ) $ 1.63              

Exercised

     (725,162 ) $ 0.88              
                         
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Outstanding at December 31, 2013

     8,055,522   $ 1.56     7.55   $ 6,704,149  
                     
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                     

Vested at December 31, 2013

     3,661,215   $ 0.91     5.50   $ 5,035,700  
                     
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