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Accounts Receivable (Details) (USD $)
Jan. 31, 2015
Oct. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Government Contract Receivable $ 855,000us-gaap_GovernmentContractReceivable $ 2,517,000us-gaap_GovernmentContractReceivable
Government Contract Receivable, Unbilled Amounts 4,973,000us-gaap_GovernmentContractReceivableUnbilledAmounts 2,886,000us-gaap_GovernmentContractReceivableUnbilledAmounts
U.S. Government accounts receivable total 5,828,000fcel_UsGovernmentAccountsReceivableTotal [1] 5,403,000fcel_UsGovernmentAccountsReceivableTotal [1]
Contract Receivable 10,566,000us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms 8,871,000us-gaap_AccountsReceivableBilledForLongTermContractsOrPrograms
Unbilled Contracts Receivable 44,234,000us-gaap_UnbilledContractsReceivable 50,101,000us-gaap_UnbilledContractsReceivable
Commercial Customers accounts receivable 54,800,000fcel_CommercialCustomersAccountsReceivable 58,972,000fcel_CommercialCustomersAccountsReceivable
Accounts Receivable, Net, Current 60,628,000us-gaap_AccountsReceivableNetCurrent 64,375,000us-gaap_AccountsReceivableNetCurrent
Allowance for Doubtful Accounts Receivable, Current 132,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent 132,000us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
POSCO Energy [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Related Parties, Current 20,500,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcel_PoscoEnergyMember		 29,900,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcel_PoscoEnergyMember
NRG Energy, Inc. [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts Receivable, Related Parties, Current 6,900,000us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcel_NRGEnergyInc.Member		 0us-gaap_AccountsReceivableRelatedPartiesCurrent
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= fcel_NRGEnergyInc.Member
Government [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Government Contract Receivable $ 3,000,000us-gaap_GovernmentContractReceivable
/ us-gaap_MajorCustomersAxis
= us-gaap_GovernmentMember		 $ 1,700,000us-gaap_GovernmentContractReceivable
/ us-gaap_MajorCustomersAxis
= us-gaap_GovernmentMember
[1] Total U.S. Government accounts receivable outstanding as of January 31, 2015 and October 31, 2014 was $3.0 million and $1.7 million, respectively.