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Debt (Details) (USD $)
3 Months Ended 6 Months Ended
Apr. 30, 2015
Apr. 30, 2015
Oct. 31, 2014
Mar. 05, 2013
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity $ 4,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity $ 4,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity    
Long-term Line of Credit 3,945,000us-gaap_LineOfCredit 3,945,000us-gaap_LineOfCredit    
Capital Lease Obligations     721,000us-gaap_CapitalLeaseObligations  
Long-term Debt, Current Maturities 4,497,000us-gaap_LongTermDebtCurrent 4,497,000us-gaap_LongTermDebtCurrent 1,439,000us-gaap_LongTermDebtCurrent  
Lease Payment Terms 36 months      
London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument [Line Items]        
Long-term Debt, Percentage Bearing Variable Interest, Percentage Rate 1.50%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
1.50%us-gaap_LongTermDebtPercentageBearingVariableInterestRate
/ us-gaap_VariableRateAxis
= us-gaap_LondonInterbankOfferedRateLIBORMember
   
NRG Energy [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity 40,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= fcel_NRGEnergyMember
40,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= fcel_NRGEnergyMember
   
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Maximum   8.50%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMaximum
/ us-gaap_DebtInstrumentAxis
= fcel_NRGEnergyMember
   
Debt Instrument, Interest Rate, Stated Percentage Rate Range, Minimum   8.00%us-gaap_DebtInstrumentInterestRateStatedPercentageRateRangeMinimum
/ us-gaap_DebtInstrumentAxis
= fcel_NRGEnergyMember
   
Connecticut Development Authority Note [Member]        
Debt Instrument [Line Items]        
Collateralized Agreements 4,000,000us-gaap_CollateralizedAgreements
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
4,000,000us-gaap_CollateralizedAgreements
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
   
Long-term Line of Credit 2,927,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
2,927,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
3,033,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
 
Debt Instrument, Face Amount 4,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
4,000,000us-gaap_DebtInstrumentFaceAmount
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
   
Debt Instrument, Interest Rate, Stated Percentage 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutDevelopmentAuthorityNoteMember
   
Connecticut Clean Energy Fund [Member]        
Debt Instrument [Line Items]        
Line of Credit Facility, Maximum Borrowing Capacity       5,900,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyFundMember
Connecticut Clean Energy and Finance Investment Authority [Member]        
Debt Instrument [Line Items]        
Long-term Line of Credit $ 6,052,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember
$ 6,052,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember
$ 6,052,000us-gaap_LineOfCredit
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember
 
Debt Instrument, Interest Rate, Stated Percentage 5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember
5.00%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= fcel_ConnecticutCleanEnergyAndFinanceInvestmentAuthorityMember