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Summary of Stock Option Activity (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Number of shares outstanding  
Beginning Balance 20,089,216
Granted   
Exercised   
Expired or Forfeited (3,412,676)
Ending Balance 16,676,540
Weighted Average Exercise Price  
Beginning Balance $ 0.1301
Granted   
Exercised   
Expired/Forfeited $ 0.1629
Ending Balance $ 0.1247
Options Outstanding, Price per Share Range  
Beginning Balance, lower limit $ 0.0061
Beginning Balance, upper limit $ 0.2334
Granted, lower limit   
Granted, upper limit   
Exercised, lower limit   
Exercised, upper limit   
Expired or Forfeited, lower limit $ 0.0015
Expired or Forfeited, upper limit $ 0.2334
Ending Balance, lower limit $ 0.0061
Ending Balance, upper limit $ 0.2334