Name:	fcel_AggregateOfferingPrice
Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

It refers to average sale price per share of shares sold under Open Market Sale Agreement

No definition available.

Name:	fcel_AverageSaleOfStockPricePerShare
Namespace Prefix:	fcel_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Class of warrant or right term of warrants or rights.

No definition available.

Name:	fcel_ClassOfWarrantOrRightTermOfWarrantsOrRights
Namespace Prefix:	fcel_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

Class of warrants or right to purchase

No definition available.

Name:	fcel_ClassOfWarrantsOrRightToPurchase
Namespace Prefix:	fcel_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Class of warrants or rights charge.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Class of warrants or rights exercised.

No definition available.

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Data Type:	xbrli:sharesItemType
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Period Type:	instant

Class of warrants or rights exercised value

No definition available.

Name:	fcel_ClassOfWarrantsOrRightsExercisedValue
Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Class of warrants or rights issued.

No definition available.

Name:	fcel_ClassOfWarrantsOrRightsIssued
Namespace Prefix:	fcel_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The number of common stock shares agreed upon to be newly issued.

No definition available.

Name:	fcel_CommonStockSharesAgreedToBeNewlyIssued
Namespace Prefix:	fcel_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Its refers to gross proceeds from the Open Market Sale Agreement.

No definition available.

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Data Type:	xbrli:monetaryItemType
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Number of incremental common stock shares approved.

No definition available.

Name:	fcel_IncrementalAuthorizedCommonStockSharesApproved
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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

Net proceeds from issuance of common stock.

No definition available.

Name:	fcel_NetProceedsFromIssuanceOfCommonStock
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Option to purchase additional common stock shares.

No definition available.

Name:	fcel_OptionToPurchaseAdditionalCommonStockShares
Namespace Prefix:	fcel_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Payment of underwriting discounts and commissions

No definition available.

Name:	fcel_PaymentOfUnderwritingDiscountsAndCommissions
Namespace Prefix:	fcel_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

The cashflow from payments of commissions and offering expenses of relating to issuance of common stock.

No definition available.

Name:	fcel_PaymentsOfCommissionsAndOfferingExpenses
Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Its refers to the percentage of commission paid to Agents on Aggregate gross proceeds from the sale of shares under the Open Market Sale Agreement.

No definition available.

Name:	fcel_PercentageOfSalesCommission
Namespace Prefix:	fcel_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

Reclassification to additional paid in capital revised estimated fair value of converted of warrant liability.

No definition available.

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of remaining common stock available for issuance under the open market agreement.

No definition available.

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Namespace Prefix:	fcel_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Exercise price per share or per unit of warrants or rights outstanding.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

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Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

The cash inflow from the additional capital contribution to the entity.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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-Paragraph 14
-Subparagraph (b)
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The cash inflow associated with the amount received from holders exercising their stock warrants.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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The number of shares issued or sold by the subsidiary or equity method investee per stock transaction.

No definition available.

Name:	us-gaap_SaleOfStockNumberOfSharesIssuedInTransaction
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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Data Type:	num:percentItemType
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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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Price of a single share of a number of saleable stocks of a company.

No definition available.

Name:	us-gaap_SharePrice
Namespace Prefix:	us-gaap_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	instant

Number of new stock issued during the period.

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Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- References

No definition available.

Name:	us-gaap_StockholdersEquityNoteAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
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Name:	srt_CounterpartyNameAxis=fcel_OrionEnergyPartnersInvestmentAgentLLCCreditFacilityMember
Namespace Prefix:
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Namespace Prefix:
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Name:	us-gaap_TypeOfArrangementAxis=fcel_InitialFundingWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_TypeOfArrangementAxis=fcel_SecondFundingWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_ShareBasedCompensationSharesAuthorizedUnderStockOptionPlansByExercisePriceRangeAxis=fcel_ExercisePriceZeroPointSixTwoMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_SubsidiarySaleOfStockAxis=fcel_UnderwritingAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_SubsidiarySaleOfStockAxis=fcel_AtMarketIssuanceSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	srt_CounterpartyNameAxis=fcel_JefferiesLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
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Name:	us-gaap_SubsidiarySaleOfStockAxis=us-gaap_IPOMember
Namespace Prefix:
Data Type:	na
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