Quarterly report pursuant to Section 13 or 15(d)

2. Summary of Significant Accounting Policies (Tables)

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2. Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2019
Accounting Policies [Abstract]  
Antidilutive shares
    March 31,
2019
    March 31,
2018
 
Options     39,711,022       37,301,300  
Warrants     26,102,430       17,590,812  
Common stock issuable upon conversion of notes payable     11,058,950       7,047,333  
Total     76,872,402       61,939,445