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2. Summary of Significant Accounting Policies (Details) - shares
9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Antidilutive shares 25,783,883 26,178,080
Options    
Antidilutive shares 21,706,512 20,757,030
Warrants    
Antidilutive shares 3,667,704 5,421,050
Common stock issuable upon converstion of notes payable    
Antidilutive shares 399,667 0