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Summary of Significant Accounting Policies (Tables)
6 Months Ended
Jun. 30, 2018
Accounting Policies [Abstract]  
Schedule of potentially dilutive securities excluded from the computation of basic and diluted net loss per share

   June 30,
2018
   June 30,
2017
 
Options to purchase common stock   15,371,765    17,248,942 
Warrants to purchase common stock   34,626,339    7,793,847 
Totals   49,998,104    25,042,789