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2. Summary of Significant Accounting Policies (Details) - shares
6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Antidilutive shares excluded from EPS 66,789,744 35,468,815
Options [Member]    
Antidilutive shares excluded from EPS 35,313,541 23,724,256
Warrants [Member]    
Antidilutive shares excluded from EPS 21,507,270 9,342,892
Convertible Notes [Member]    
Antidilutive shares excluded from EPS 9,968,933 2,401,667