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Summary of Significant Accounting Policies (Tables)
3 Months Ended
Mar. 31, 2018
Summary of Significant Accounting Policies [Abstract]  
Potentially Dilutive Securities Excluded from Computations of Diluted Weighted Average Shares Outstanding
The following potentially dilutive securities have been excluded from the computations of diluted weighted average shares outstanding as they would be anti-dilutive:

 
As of March 31,
 
 
2018
 
2017
 
Stock options to purchase Common Stock
  
7,341,468
   
6,193,461
 
Warrants to purchase Common Stock
  
78,596
   
403,782
 
Total
  
7,420,064
   
6,597,243