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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% |

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