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2. Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Antidilutive shares
   June 30,
2018
   June 30,
2017
 
Options   37,301,300    35,313,541 
Warrants   5,006,355    21,507,270 
Common stock issuable upon conversion of notes payable   5,287,502    9,968,933 
Total   47,595,157    66,789,744