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)
 3 Months Ended 12 Months Ended
Mar. 31, 2014
Dec. 31, 2013
Class Of Warrant Or Right [Line Items]    
Number of warrants 165,517 263,463
Series E Redeemable Convertible Preferred Stock
    
Class Of Warrant Or Right [Line Items]    
Number of shares exercise price 2.69244  
Series E Redeemable Convertible Preferred Stock | 2017
    
Class Of Warrant Or Right [Line Items]    
Number of warrants 4,222  
Number of shares exercise price 9.612  
Expiration date 2017  
Common Stock
    
Class Of Warrant Or Right [Line Items]    
Number of warrants 161,295  
Common Stock | 2017-2019
    
Class Of Warrant Or Right [Line Items]    
Number of warrants 161,295 233,611
Number of shares exercise price 0.300 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  
Series C Preferred Stock | 2017
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   14,215
Number of shares exercise price   17.580
Expiration date   2015
Series D Preferred Stock | 2013-2014
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   11,415
Number of shares exercise price   21.900
Series D Preferred Stock | 2013-2014 | Minimum
    
Class Of Warrant Or Right [Line Items]    
Expiration date   2013
Series E Preferred Stock | 2017
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   3,120
Number of shares exercise price   9.612
Expiration date   2015
Series E Preferred Stock | 2016
    
Class Of Warrant Or Right [Line Items]    
Number of warrants   1,102
Number of shares exercise price   9.612
Expiration date   2016