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Stockholders' Equity (Tables)
9 Months Ended
Sep. 30, 2015
Stockholders' Equity [Abstract]  
Summary of Outstanding Common Stock Warrants
Outstanding common stock warrants consist of the following:
Issue Date
 
Expiration Date
 
Total Warrants
  
Exercise Price
        
4/26/2013
 
4/26/2018
 
69,321
  
$  11.18
10/31/2013
 
4/30/2019
 
685,715
  
$    0.75
2/5/2014
 
2/5/2019
 
1,329,731
  
$    0.75
7/24/2014
 
7/24/2019
 
6,198,832
  
$ 0.75 - $ 2.45
7/24/2014
 
1/24/2016
 
4,795,321
  
$ 0.75
6/22/2015
 
6/22/2020
 
3,000,000
  
$    0.75
    
16,078,920