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8. Stockholder's Equity (Tables)
6 Months Ended
Jun. 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     1,579,417     $ 2.50-$4.50  
Warrants exercised     (52,500 )   $ 2.50  
Warrants expired     (350,000 )   $ 0.30-$0.40  
Balance, June 30, 2012     1,776,917     $ 0.20-$4.50  
The above common stock warrants expire as follows:                

 

Year Ended December 31:

               
2014     1,050,000          
2015     476,917          
Thereafter     250,000          
      1,776,917