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Convertible Notes - 2012 Notes (Details)
Oct. 30, 2013
USD ($)
$ / shares
shares
Sep. 30, 2013
USD ($)
Aug. 09, 2013
USD ($)
Note
May. 23, 2013
USD ($)
Note
Mar. 28, 2013
USD ($)
Note
Dec. 07, 2012
USD ($)
Note
Dec. 31, 2012
USD ($)
Short-term Debt [Line Items]              
Principal and accrued interest outstanding shares converted into common stock | shares 1,860,363            
Conversion price of notes (in dollars per share) | $ / shares $ 10.00            
2012 Notes | Initial public offer              
Short-term Debt [Line Items]              
Principal and accrued interest outstanding shares converted into common stock | shares 1,860,363            
Conversion price of notes (in dollars per share) | $ / shares $ 10.00            
2012 Notes | Convertible debt              
Short-term Debt [Line Items]              
Convertible notes authorized and available for sale           $ 15,000,000.0 $ 12,000,000.0
Convertible notes, interest rate           8.00%  
Number of individual convertible notes | Note     5 5 5 5  
Convertible notes, aggregate principal balance     $ 4,500,000.0 $ 4,500,000.0 $ 3,000,000.0 $ 3,000,000.0  
Additional convertible notes authorized     3,000,000.0        
Aggregate convertible notes authorized     18,000,000.0        
Gains (losses) recorded as part of restructuring     $ 0        
Aggregate proceeds   $ 3,000,000.0          
Fair value of embedded derivative $ 0 $ 96,000