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Warrant Activity (Detail) (USD $)
9 Months Ended
Sep. 30, 2012
Number of shares  
Exercisable at end of period   
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Disclosures [Abstract]  
Outstanding - September 30, 2012   
Exercisable at end of period   
Warrant
 
Number of shares  
Outstanding - January 1, 2012 5,452,141
Granted during the period 20,599,342
Expired during the period (147,500)
Exercised during the period 0
Outstanding - September 30, 2012 25,903,983
Exercisable at end of period 25,759,983
Share Based Compensation Arrangement By Share Based Payment Award Equity Instruments Other Than Options Additional Disclosures [Abstract]  
Outstanding - January 1, 2012 $ 1.18
Granted during the period $ 0.67
Expired during the period $ 2.25
Exercised during the period $ 0
Outstanding - September 30, 2012 $ 0.77
Exercisable at end of period $ 0.77