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2. Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2019
Accounting Policies [Abstract]  
Antidilutive shares
   June 30,
2019
   June 30,
2018
 
Options   39,450,603    37,301,300 
Warrants   25,713,204    5,006,355 
Common stock issuable upon conversion of notes payable   12,784,543    5,287,502 
Total   77,948,350    47,595,157