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Long-Term Debt - Hercules Term Loan - Additional Information (Details) - USD ($) |  | 1 Months Ended | 3 Months Ended |
--- | --- | --- | --- | ---
Feb. 27, 2015 | Feb. 29, 2016 | Mar. 31, 2016 | Mar. 31, 2015 | Dec. 31, 2015
Debt Instrument [Line Items] |  |  |  |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  | 165,000 |  |  |
Exercise price of warrants (in dollars per share) |  | $ 0.77 |  |  |
Estimated fair value of warrants |  | $ 100,000 |  |  |
Exercisable period of warrants |  | 5 years |  |  |
Warrants expiration period |  | 2021-02 |  |  |
Carrying value of the loan |  |  | $ 46,251,000 |  | $ 48,667,000
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 | Jun. 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 |  |  | $ 200,000 | $ 49,000 |
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 |  |  |  |
Estimated fair value of warrants | $ 500,000 |  |  |  |
Exercisable period of warrants | 5 years |  |  |  |
Warrants expiration period | 2020-02 |  |  |  |
Outstanding principal balance |  |  | 20,000,000 |  | 20,000,000
Carrying value of the loan |  |  | $ 19,800,000 |  | $ 19,700,000
Minimum [Member] | Hercules Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Percentage bearing variable rate |  |  | 9.40% |  |
Prime Rate [Member] | Hercules Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Basis spread, addition |  |  | 9.40% |  |
Basis spread, subtraction |  |  | 7.25% |  |

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