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Stock Options (Tables)
6 Months Ended
Jun. 30, 2012
Stock Options Tables  
Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at June 30, 2012:

 

   

Number of Share

Options

   

Weighted Average

Exercise Price

   

Weighted Average

Remaining

Contractual Term

in Years

   

Aggregate

Intrinsic Value(1)

 
Outstanding at December 31, 2011     2,529,000     $ 1.07       6.09     $  
Granted     20,000     $ 0.18           $  
Exercised         $           $  
Forfeited or Cancelled     (198,000 )   $ 1.80           $  
Outstanding at June 30, 2012     2,351,000     $ 1.00       5.55     $  
Exercisable at June 30, 2012     1,838,000     $ 1.17       4.53     $  
Vested and expected to vest (2)     1,883,000     $ 1.15       6.03     $  

 

Unvested share activity

 

Unvested share activity for the six months ended June 30, 2012 is summarized below:

 

   

Unvested

Number of

Options

   

Weighted

Average

Grant Date Fair

Value

 
Unvested balance at December 31, 2011     1,403,000     $ 0.26  
Granted     20,000     $ 0.15  
Vested     (866,000 )   $ 0.20  
Forfeited     (44,000 )   $ 0.35  
Unvested balance at June 30, 2012     513,000     $ 0.29  

Fair Value of Stock options

The fair values of all stock options granted during the six months ended June 30, 2012 and 2011 were estimated on the date of grant using the Black-Scholes option-pricing model with the following range of assumptions:

 

    For the six months ended  
   

June 30,

2012

   

June 30,

2011

 
Expected life (in years)     6.5       2.5 – 6.5  
Average risk-free interest rate     1.66 %     2.00 %
Expected volatility     108 %     107 - 132 %
Expected dividend yield     0 %     0 %
Forfeiture rate     3 %     3 %