Quarterly report pursuant to Section 13 or 15(d)

Warrants - Summary of Outstanding Warrants (Details)

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Warrants - Summary of Outstanding Warrants (Details) (USD $)
 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
Class Of Warrant Or Right [Line Items]    
Number of warrants   263,463
Common Stock | 2017-2019
    
Class Of Warrant Or Right [Line Items]    
Number of warrants 145,089 233,611
Exercise price/share $ 0.30 $ 0.300
Common Stock | 2017-2019 | Minimum
    
Class Of Warrant Or Right [Line Items]    
Expiration date 2017 2017
Common Stock | 2017-2019 | Maximum
    
Class Of Warrant Or Right [Line Items]    
Expiration date 2019 2019
Series C Preferred Stock | 2015
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   14,215
Exercise price/share   $ 17.580
Expiration date   2015
Series D Preferred Stock | 2013-2014
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   11,415
Exercise price/share   $ 21.900
Series D Preferred Stock | 2013-2014 | Minimum
    
Class Of Warrant Or Right [Line Items]    
Expiration date   2013
Series D Preferred Stock | 2013-2014 | Maximum
    
Class Of Warrant Or Right [Line Items]    
Expiration date   2014
Series E Preferred Stock | 2015
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   3,120
Exercise price/share   $ 9.612
Expiration date   2015
Series E Preferred Stock | 2016
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   1,102
Exercise price/share   $ 9.612
Expiration date   2016