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3. Interest, Advances and Promissory Notes Payable (Detail) - Summary Interest Payable Activity (USD $)
12 Months Ended
Dec. 31, 2012
Mar. 31, 2013
Dec. 31, 2011
$ 1,569,321 $ 1,695,839 $ 1,930,695
Interest incurred on promissory notes payable 126,802 126,885  
Repayment of interest payable through line of credit (6,500)    
Repayment of interest payable through exercise of options (860,244)    
Other $ (201)