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Other Current Assets (Details) (USD $)
Apr. 30, 2015
Oct. 31, 2014
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity  
Advance payments to vendors 4,155,000fcel_AdvancePaymentsToVendors [1] 2,372,000fcel_AdvancePaymentsToVendors [1]
Notes receivable 677,000us-gaap_NotesAndLoansReceivableNetCurrent 529,000us-gaap_NotesAndLoansReceivableNetCurrent
Prepaid expenses and other 5,575,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent [2] 4,498,000us-gaap_PrepaidExpenseAndOtherAssetsCurrent [2]
Total 10,536,000us-gaap_OtherAssetsCurrent 7,528,000us-gaap_OtherAssetsCurrent
NRG Energy [Member]    
Debt Instrument [Line Items]    
Line of Credit Facility, Maximum Borrowing Capacity 40,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= fcel_NRGEnergyMember		  
Letter of Credit [Member]    
Debt Instrument [Line Items]    
Debt issuance costs $ 129,000us-gaap_DeferredFinanceCostsCurrentNet
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember		 [3] $ 129,000us-gaap_DeferredFinanceCostsCurrentNet
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember		 [3]
[1] Advance payments to vendors relate to payments for inventory purchases ahead of receipt.
[2] Primarily relates to other prepaid vendor expenses including insurance, rent and lease payments.
[3] Represents the current portion of direct deferred finance costs relating to securing a $40.0 million loan facility with NRG and will be amortized over the five-year life of the facility.