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v2.4.1.9

Shareholders' Equity (Deficit) (Details) (USD $) In Thousands, except Share data, unless otherwise specified | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Oct. 31, 2014 | Jan. 31, 2014 | Oct. 31, 2014 | Oct. 31, 2013 | Oct. 31, 2012 | Jul. 31, 2012 | Jul. 30, 2014 | Jan. 23, 2014 | Jun. 25, 2013 | Dec. 20, 2012
Convertible Debt | $ 0 us-gaap_ConvertibleDebt |  | $ 0 us-gaap_ConvertibleDebt | $ 38,000 us-gaap_ConvertibleDebt |  |  |  |  | $ 38,000 us-gaap_ConvertibleDebt |
Stock Issued During Period, Shares, Conversion of Convertible Securities |  |  | 24,500,000 us-gaap_StockIssuedDuringPeriodSharesConversionOfConvertibleSecurities |  |  |  |  |  |  |
Common stock issued to settle make-whole obligation, shares |  |  | 5,514,272 fcel_StockIssuedDuringPeriodSharesConversionofConvertibleSecuritiesDebtObligation |  |  |  |  |  |  |
Stock Issued During Period, Shares, Conversion of Convertible Securities, Accrued Interest |  |  | 300,000 fcel_StockIssuedDuringPeriodSharesConversionofConvertibleSecuritiesAccruedInterest |  |  |  |  |  |  |
Stock Issued During Period, Shares, Acquisitions |  |  |  | 3,526,764 us-gaap_StockIssuedDuringPeriodSharesAcquisitions |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  |  |  |  |  |  |  |  | 61.00%us-gaap_MinorityInterestOwnershipPercentageByNoncontrollingOwners
Stock Issued During Period, Shares, New Issues | 14,644,352 us-gaap_StockIssuedDuringPeriodSharesNewIssues | 23,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  | 4,300,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues |  |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | 105,966 us-gaap_StockIssuedDuringPeriodValueNewIssues | 5,548 us-gaap_StockIssuedDuringPeriodValueNewIssues | 64,003 us-gaap_StockIssuedDuringPeriodValueNewIssues |  |  |  |  |
Common stock issued relating to full exercise of an over allottment option |  |  |  |  |  |  |  | 3,000,000 fcel_CommonStockIssuedRelatingToFullExerciseOfOverAllottmentOption |  |
Price Per Share for New Common Stock Issuance |  |  |  |  |  |  | $ 2.39 fcel_PricePerShareForNewCommonStockIssuance | $ 1.50 fcel_PricePerShareForNewCommonStockIssuance |  |
Common Stock, Par or Stated Value Per Share | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare |  | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare | $ 0.0001 us-gaap_CommonStockParOrStatedValuePerShare |  |  |  |  |  |
Class of Warrant or Right, Exercise Price of Warrants or Rights | $ 3.35 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  | $ 3.35 us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1 |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | 35,000 us-gaap_ProceedsFromIssuanceOfCommonStock |  | 105,844 us-gaap_ProceedsFromIssuanceOfCommonStock | 5,040 us-gaap_ProceedsFromIssuanceOfCommonStock | 64,003 us-gaap_ProceedsFromIssuanceOfCommonStock |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 18,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  | 18,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance |  |  |  |  |  |  |
Class of Warrant or Right, Unissued | 1,250,000 us-gaap_ClassOfWarrantOrRightUnissued |  | 1,250,000 us-gaap_ClassOfWarrantOrRightUnissued |  |  |  |  |  |  |
number of tranches of warrants | 2.0 fcel_Numberoftranchesofwarrants |  | 2.0 fcel_Numberoftranchesofwarrants |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 5,750,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  | 5,750,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights | 5,000,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights |  |  |  |  |  |
Class of Warrant or Right, Outstanding | 3,750,000 us-gaap_ClassOfWarrantOrRightOutstanding |  | 3,750,000 us-gaap_ClassOfWarrantOrRightOutstanding |  |  |  |  |  |  |
Class of Warrant or Right, Weighted Average Strike Price of Warrants or Rights Outstanding | $ 2.08 fcel_ClassofWarrantorRightWeightedAverageStrikePriceofWarrantsorRightsOutstanding |  | $ 2.08 fcel_ClassofWarrantorRightWeightedAverageStrikePriceofWarrantsorRightsOutstanding |  |  |  |  |  |  |
NRG Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Class of Warrant or Right, Number of Securities Called by Warrants or Rights | 2,000,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = fcel_NRGEnergyInc.Member |  | 2,000,000 us-gaap_ClassOfWarrantOrRightNumberOfSecuritiesCalledByWarrantsOrRights / us-gaap_StatementEquityComponentsAxis = fcel_NRGEnergyInc.Member |  |  |  |  |  |  |
Public stock offering [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock | 32,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementEquityComponentsAxis = fcel_PublicstockofferingMember |  |  |  |  |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 59,683,252 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 4,295,800 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 45,012,306 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Stock Issued During Period, Value, New Issues |  |  | 6 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 1 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember | 5 us-gaap_StockIssuedDuringPeriodValueNewIssues / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  | 5,600 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember |  |  |  |  |  |
Common Stock [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  | 19,700,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  | 41,300 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_StatementClassOfStockAxis = us-gaap_CommonStockMember / us-gaap_StatementEquityComponentsAxis = us-gaap_CommonStockMember |  |  |  |  |  |  |
POSCO Energy [Member] |  |  |  |  |  |  |  |  |  |
Stock Issued During Period, Shares, New Issues |  |  |  | 20,000,000 us-gaap_StockIssuedDuringPeriodSharesNewIssues / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember |  |  |  |  |  |
Proceeds from Issuance of Common Stock |  |  |  |  |  | $ 30,000 us-gaap_ProceedsFromIssuanceOfCommonStock / us-gaap_MajorCustomersAxis = fcel_PoscoEnergyMember |  |  |  |
NRG Energy, Inc. [Member] |  |  |  |  |  |  |  |  |  |
Common Stock, Capital Shares Reserved for Future Issuance | 5,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_ClassOfWarrantOrRightAxis = fcel_NRGEnergyInc.Member |  | 5,000,000 us-gaap_CommonStockCapitalSharesReservedForFutureIssuance / us-gaap_ClassOfWarrantOrRightAxis = fcel_NRGEnergyInc.Member |  |  |  |  |  |  |

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