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2. Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2017
Accounting Policies [Abstract]  
Antidilutive shares
    September 30,
2017
    September 30,
2016
 
Options     35,575,677       23,624,256  
Warrants     17,420,770       12,451,892  
Common stock issuable upon conversion of notes payable     4,957,333       3,776,792  
Total     57,953,780       39,852,940