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Stockholders' Equity (Tables)
3 Months Ended
Mar. 31, 2017
Equity [Abstract]  
Summary of Warrants Outstanding

The following table summarizes the Company’s outstanding warrants at March 31, 2017:

 

Exercise prices

   Number of Shares
Underlying Warrants
     Expiration  

$39.00

     462        April 27, 2017  

$5.20

     1,300,002        June 2, 2020  

$0.90

     12,777,777        December 21, 2021  
  

 

 

    

Total warrants outstanding

     14,078,241