Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt and Other Financings - Hercules Term Loan - Additional Information (Details)

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Long-Term Debt and Other Financings - Hercules Term Loan - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Feb. 27, 2015
Sep. 30, 2015
Sep. 30, 2015
Dec. 31, 2014
Debt Instrument [Line Items]        
Debt issuance costs       $ 0
Hercules Loan [Member]        
Debt Instrument [Line Items]        
Maturity date Sep. 01, 2018      
Variable rate basis     The Hercules Term Loan has a variable interest rate that is the greater of either (i) 9.40% plus the prime rate as reported from time to time in The Wall Street Journal minus 7.25%, or (ii) 9.40%.  
Period of principal and interest amortized 30 months      
Amortization of interest payments period end date Jul. 01, 2016      
Period of interest 1 month      
Prepayment fee within twelve months of maturity 3.00%      
Prepayment fee after twelve months but before twenty four months of maturity 2.00%      
Prepayment fee after twenty four months of maturity 1.00%      
Additional interest rate in case of default 5.00%      
Debt issuance costs $ 500,000      
Final payment fee $ 1,200,000      
Amortization of debt discount   $ 100,000 $ 300,000  
Aggregate number of unregistered shares of common stock called by warrants (in shares) 181,268      
Exercise price of warrants (in dollars per share) $ 3.31      
Fair value of warrant liability $ 500,000      
Exercisable period of warrants 5 years      
Warrants expiration period 2020-02      
Outstanding principal balance   $ 20,000,000 $ 20,000,000  
Minimum [Member] | Hercules Loan [Member]        
Debt Instrument [Line Items]        
Percentage bearing variable rate   9.40% 9.40%  
Prime Rate [Member] | Hercules Loan [Member]        
Debt Instrument [Line Items]        
Basis spread, addition     9.40%  
Basis spread, subtraction   7.25% 7.25%