Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
Apr. 30, 2015	Apr. 30, 2014
Cash flows from operating activities:
Net loss	$ (14,151)us-gaap_ProfitLoss	$ (26,854)us-gaap_ProfitLoss
Adjustments to reconcile net loss to net cash used in operating activities:
Share-based compensation	1,507us-gaap_ShareBasedCompensation	1,327us-gaap_ShareBasedCompensation
Gain from change in fair value of embedded derivatives	(3)	(141)
Make whole derivative expense	0fcel_Makewholederivativeexpense	8,652fcel_Makewholederivativeexpense
Depreciation	1,944us-gaap_Depreciation	2,178us-gaap_Depreciation
Interest expense on preferred stock obligation	930fcel_AmortizationOfBondPremium	969fcel_AmortizationOfBondPremium
Unrealized foreign exchange gains	(941)	(704)
Other non-cash transactions, net	(13)us-gaap_OtherNoncashIncomeExpense	220us-gaap_OtherNoncashIncomeExpense
Decrease (increase) in operating assets:
Accounts receivable	20,854	14,337
Inventories	(15,982)us-gaap_IncreaseDecreaseInInventories	472us-gaap_IncreaseDecreaseInInventories
Project assets	(9,161)fcel_IncreaseDecreaseinprojectassets	0fcel_IncreaseDecreaseinprojectassets
Other assets	(2,938)	3,684
Increase (decrease) in operating liabilities:
Accounts payable	(2,733)	(9,922)
Accrued liabilities	(634)	(10,887)
Deferred revenue	9,013	991
Net cash used in operating activities	(12,308)	(15,678)
Cash flows from investing activities:
Capital expenditures	(3,321)	(1,918)
Net cash used in investing activities	(3,321)	(1,918)
Cash flows from financing activities:
Repayment of debt	(240)us-gaap_RepaymentsOfLongTermDebt	(5,765)us-gaap_RepaymentsOfLongTermDebt
Proceeds from debt	3,000us-gaap_ProceedsFromOtherDebt	250us-gaap_ProceedsFromOtherDebt
Increase in restricted cash and cash equivalents	(2,145)	(15,120)
Payment of preferred dividends and return of capital	(2,144)	(2,175)
Proceeds from sale of common stock, net of registration fees	16,773	36,854
Net cash provided by financing activities	15,244	14,044
Effects on cash from changes in foreign currency rates	(340)	110
Net increase in cash and cash equivalents	(725)	(3,442)
Cash and cash equivalents-beginning of period	83,710	67,696
Cash and cash equivalents-end of period	82,985	64,254
Supplemental cash flow disclosures:
Cash interest paid	326us-gaap_InterestPaid	1,617us-gaap_InterestPaid
Noncash financing and investing activity:
Common stock issued for Employee Stock Purchase Plan in settlement of prior year accrued employee contributions	168	106
Accrued sale of common stock, cash received in subsequent period	521fcel_AccruedSaleofCommonStock	885fcel_AccruedSaleofCommonStock
Debt Conversion and Make Whole Obligation [Member]
Noncash financing and investing activity:
Stock Issued During Period, Value, Conversion of Convertible Securities	$ 0	$ 45,060

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The cash outflow for debt initially having maturity due after one year or beyond the normal operating cycle, if longer.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 15

-Subparagraph (b)

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-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

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The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

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-Name Accounting Standards Codification

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- Definition

The gross value of stock issued during the period upon the conversion of convertible securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Article 3

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-Name Accounting Standards Codification

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 29, 30, 31

-Article 5

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