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9. Stockholder's Equity (Tables)
9 Months Ended
Sep. 30, 2012
Equity [Abstract]  
Common Stock Warrants

Transactions in common stock warrants are as follows:

 

    Number of     Exercise  
    Warrants     Prices  
    Balance, December 31, 2010     725,000     $ 0.20-$0.75  
Warrants exercised     (125,000 )   $ 0.30-$0.40  
Balance, December 31, 2011     600,000     $ 0.30-$0.60  
Warrants granted     1,684,667     $ 2.50-$4.50  
Warrants exercised     (250,000 )   $ 0.30-$2.50  
Warrants expired     (150,000 )   $ 0.40  
Balance, September 30, 2012     1,884,667     $ 0.25-$4.50  
Warrants Maturity
The above common stock warrants expire as follows:                
                 
Year Ended December 31:                
2014     1,157,750          
2015     476,917          
Thereafter     250,000          
      1,884,667