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Long-Term Debt and Other Financings - General Electric Capital Corporation (GECC) Term Loan - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 1 Months Ended | 9 Months Ended
--- | --- | --- | --- | ---
Feb. 27, 2015 | Sep. 27, 2012 | Dec. 31, 2011 | Sep. 30, 2015 | Sep. 30, 2014
Debt Instrument [Line Items] |  |  |  |  |
Carrying value of the loan |  |  |  | $ 48,585 |
Repayment of principal, fees and accrued interest |  |  |  | 6,128 | $ 4,875
Loss on extinguishment of debt |  |  |  | (429) |
GECC Term Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding principal balance |  |  | $ 10,000 |  |
Aggregate number of unregistered shares of common stock called by warrants (in shares) |  | 39,346 | 263,158 |  |
Exercise price of warrants (in dollars per share) |  | $ 3.54 | $ 1.14 |  |
Exercisable period of warrants |  | 5 years | 5 years |  |
Warrants expiration period |  | 2017-09 | 2016-12 |  |
Fair value of warrant liability |  | $ 100 | $ 200 |  |
Repayment of principal, fees and accrued interest | $ 5,500 |  |  |  |
Loss on extinguishment of debt |  |  |  | (400) |
Hercules Loan [Member] |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |
Outstanding principal balance |  |  |  | $ 20,000 |
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 |  |  |  |
Exercisable period of warrants | 5 years |  |  |  |
Warrants expiration period | 2020-02 |  |  |  |
Fair value of warrant liability | $ 500 |  |  |  |
Carrying value of the loan | $ 20,000 |  |  |  |

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- Definition Amount of long-term debt before deduction of unamortized discount or premium. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt, with initial maturities beyond one year or the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 20 -Article 5 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 16 -Article 9 + Details
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