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Other Assets, net (Details) (USD $)
Jan. 31, 2015
Oct. 31, 2014
Long-term stack residual value $ 2,725,000fcel_LongTermStackResidualValue [1] $ 2,725,000fcel_LongTermStackResidualValue [1]
Other 458,000us-gaap_OtherAssetsMiscellaneousNoncurrent 521,000us-gaap_OtherAssetsMiscellaneousNoncurrent
Other assets, net 3,634,000us-gaap_OtherAssetsNoncurrent 3,729,000us-gaap_OtherAssetsNoncurrent
NRG Energy [Member]    
Line of Credit Facility, Maximum Borrowing Capacity 40,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= fcel_NRGEnergyMember		  
Letter of Credit [Member]    
Debt issuance costs $ 451,000us-gaap_DeferredFinanceCostsNoncurrentNet
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember		 [2] $ 483,000us-gaap_DeferredFinanceCostsNoncurrentNet
/ us-gaap_DebtInstrumentAxis
= us-gaap_LetterOfCreditMember		 [2]
[1] Relates to expected residual value for module exchanges performed under the Company's service agreements where the useful life extends beyond the contractual term of the service agreement and the Company obtains title for the module from the customer upon expiration or non-renewal of the service agreement. If the Company does not obtain rights to title from the customer, the cost of the module is expensed at the time of the module exchange.
[2] Represents the long-term 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.