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2. Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2019
Accounting Policies [Abstract]  
Antidilutive shares
   September 30,
2019
   September 30,
2018
 
Options   39,450,603    35,351,300 
Warrants   25,941,062    7,288,855 
Common stock issuable upon conversion of notes payable   12,689,373    7,204,552 
Total   78,081,038    49,844,707