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2. Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2017
Accounting Policies [Abstract]  
Antidilutive shares
   June 30,
2017
   June 30,
2016
 
Options   35,581,398    23,724,256 
Warrants   35,313,541    9,342,892 
Common stock issuable upon conversion of notes payable   9,968,933    2,401,667 
Total   66,789,744    35,468,815