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Debt and Leases (Details) (USD $) | 3 Months Ended | 6 Months Ended |  |  | 6 Months Ended |  |  |  |  |  | 6 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 30, 2014 | Apr. 30, 2014 | Oct. 31, 2013 | Jun. 25, 2013 | Jun. 25, 2013 Convertible Debt [Member] | Apr. 30, 2014 Connecticut Development Authority Note [Member] | Oct. 31, 2013 Connecticut Development Authority Note [Member] | Mar. 05, 2013 Connecticut Clean Energy Fund [Member] | Apr. 30, 2014 Connecticut Clean Energy and Finance Investment Authority [Member] | Oct. 31, 2013 Connecticut Clean Energy and Finance Investment Authority [Member] | Mar. 05, 2013 Connecticut Clean Energy and Finance Investment Authority [Member] | Apr. 30, 2014 Parent [Member] | Apr. 30, 2014 London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Amount Outstanding | $ 945,000 | $ 945,000 | $ 6,500,000 |  |  | $ 3,138,000 | $ 3,246,000 |  | $ 6,051,000 | $ 5,744,000 |  |  |
Senior Unsecured Convertible Notes | 1,000,000 | 1,000,000 | 38,000,000 | 38,000,000 |  |  |  |  |  |  |  |  |
Capital Lease Obligations | 596,000 | 596,000 | 497,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Gross | 11,730,000 | 11,730,000 | 53,987,000 |  |  |  |  |  |  |  |  |  |
Debt Instrument, Unamortized Discount | (73,000) | (73,000) | (3,106,000) |  |  |  |  |  |  |  |  |  |
Long-term Debt | 11,657,000 | 11,657,000 | 50,881,000 |  |  |  |  |  |  |  |  |  |
Long-term Debt, Current Maturities | (1,346,000) | (1,346,000) | (6,931,000) |  |  |  |  |  |  |  |  |  |
Long-term Debt, Excluding Current Maturities | 10,311,000 | 10,311,000 | 43,950,000 |  |  |  |  |  |  |  |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | 8,000,000 | 8,000,000 |  |  |  |  |  | 5,900,000 |  |  |  |  |
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate |  |  |  |  |  |  |  |  |  |  |  |  | 1.50%
Debt Instrument, Term |  |  |  |  |  | 10 years |  |  |  |  |  |  |
Debt Instrument, Interest Rate, Stated Percentage |  |  |  |  | 8.00% | 5.00% |  |  |  |  | 5.00% |  |
Debt Instrument, Convertible, Conversion Ratio |  | 645.1613 |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Converted Instrument, Amount |  | 1,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Convertible, Conversion Price |  |  |  | $ 1.55 |  |  |  |  |  |  |  |  |
embedded derivative cash payment | 300,000 |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative, Fair Value of Embedded Derivative Liability | 200,000 | 200,000 | 4,700,000 |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities, Debt Obligation |  | 5,399,747 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  | 23,870,979 |  |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Value, Other |  | 12,639,000 |  |  |  |  |  |  |  |  |  | 12,639,000 |
Embedded Derivative, Loss on Embedded Derivative | 8,500,000 |  |  |  |  |  |  |  |  |  |  |  |
Embedded Derivative, No Longer Bifurcated, Amount Reclassified to Stockholders' Equity | 4,400,000 |  |  |  |  |  |  |  |  |  |  |  |
Debt Conversion, Original Debt, Amount | 37,000,000 | 37,000,000 |  |  |  |  |  |  |  |  |  |  |
Debt Instrument, Face Amount |  |  |  |  |  | 4,000,000 |  |  |  |  |  |  |
Collateralized Agreements |  |  |  |  |  | $ 4,000,000 |  |  |  |  |  |  |

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