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Debt and Leases (Details) (USD $)
 3 Months Ended 9 Months Ended 3 Months Ended
Jul. 31, 2013
Jul. 31, 2013
Jul. 31, 2012
Jun. 20, 2013
Apr. 12, 2013
Oct. 31, 2012
Jun. 20, 2013
Convertible Debt [Member]
Jul. 31, 2013
Connecticut Development Authority Note [Member]
Oct. 31, 2012
Connecticut Development Authority Note [Member]
Jul. 31, 2013
Connecticut Clean Energy Fund [Member]
Mar. 05, 2013
Connecticut Clean Energy Fund [Member]
Jan. 31, 2013
Connecticut Clean Energy Fund [Member]
Oct. 31, 2012
Connecticut Clean Energy Fund [Member]
Jul. 31, 2013
Connecticut Clean Energy and Finance Investment Authority [Member]
Apr. 30, 2013
Connecticut Clean Energy and Finance Investment Authority [Member]
Mar. 05, 2013
Connecticut Clean Energy and Finance Investment Authority [Member]
Debt Instrument [Line Items]                                
Line of Credit Facility, Amount Outstanding $ 4,000,000 $ 4,000,000       $ 4,000,000   $ 3,302,000 $ 3,466,000 $ 0   $ 900,000 $ 847,000 $ 4,425,000    
Senior Unsecured Convertible Notes 38,000,000 38,000,000   38,000,000   0                    
Capital Lease Obligations 352,000 352,000       234,000                    
Long-term Debt, Gross 50,079,000 50,079,000       8,547,000                    
Long-term Debt 46,948,000 46,948,000       8,547,000                    
Debt Instrument, Unamortized Discount (3,131,000) [1] (3,131,000) [1]       0 [1]                    
Long-term Debt, Current Maturities (4,403,000) (4,403,000)       (5,161,000)                    
Long-term Debt, Excluding Current Maturities 42,545,000 42,545,000       3,386,000                    
Line of Credit Facility, Maximum Borrowing Capacity 8,000,000 8,000,000     5,000,000           5,900,000          
Proceeds from Notes Payable                           900,000 2,600,000  
Proceeds from debt   41,500,000 0                          
Debt Instrument, Interest Rate, Stated Percentage             8.00%                 5.00%
Debt Instrument, Convertible, Conversion Ratio 645.1613                              
Debt Conversion, Converted Instrument, Amount 1,000                              
Debt Instrument, Convertible, Conversion Price       $ 1.55                        
Proceeds from Convertible Debt 35,500,000                              
Payments of Debt Issuance Costs   2,472,000 0                          
Embedded Derivative, Fair Value of Embedded Derivative Liability $ 3,500,000 $ 3,500,000   $ 3,200,000                        
[1] The debt discount recorded in connection with the issuance of the Company’s unsecured convertible notes is recorded on the consolidated balance sheets as a reduction to associated debt balance. The Company amortizes the debt discount to interest expense over the term of the debt.