XML 55 R41.htm IDEA: XBRL DOCUMENT v3.21.2

Nature of Business and Basis of Presentation - Additional Information (Details) $ in Thousands, $ in Millions			1 Months Ended		2 Months Ended	3 Months Ended
	Jun. 11, 2021 USD ($)	Dec. 07, 2020 USD ($)	Feb. 28, 2021 USD ($)	Dec. 31, 2020 USD ($) shares	Jul. 31, 2021 USD ($) shares	Jul. 31, 2021 USD ($) shares	Jan. 31, 2021 shares	Jul. 31, 2020 shares	Jan. 31, 2020 shares	Dec. 17, 2020 USD ($)	Dec. 17, 2020 CAD ($)	Oct. 31, 2020 USD ($)
Nature Of Business And Basis Of Presentation [Line Items]
Cash and cash equivalents, unrestricted					$ 468,565	$ 468,565						$ 149,867
Underwritten offering shares | shares				25,000,000.0
Net proceeds from underwriting shares after deducting underwriting discounts and commissions				$ 156,400
Unrestricted cash					$ 47,500	$ 47,500
Common Stock
Nature Of Business And Basis Of Presentation [Line Items]
Stock issued during period shares new issues | shares						43,978,999	25,000,000	25,144,704	7,938,228
Common Stock | At Market Issuance Sales Agreement [Member] | Jefferies LLC [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Aggregate offering price	$ 500,000
Stock issued during period shares new issues | shares					44,000,000.0
Net proceeds from issuance of common stock					$ 369,000
Enbridge Inc. [Member] | Series 1 Preferred Shares [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Related Party Transaction, Due from (to) Related Party										$ 21,500	$ 27.4
Sr. Secured Debt [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Settlement of outstanding principal payment and interest		$ 87,300
Unrestricted cash		$ 11,200
Liberty Bank Promissory Note (PPP Note) [Member]
Nature Of Business And Basis Of Presentation [Line Items]
Repayments of debt			$ 6,500

X

- Definition

This refers to the offering price for market offering program under the Open Market Sale Agreement with Jefferies LLC and Barclays Capital Inc.(Agent)

+ References

No definition available.

+ Details

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

X

- Definition

Nature of business and basis of presentation.

+ References

No definition available.

+ Details

Name:	fcel_NatureOfBusinessAndBasisOfPresentationLineItems
Namespace Prefix:	fcel_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Net proceeds from issuance of common stock.

+ References

No definition available.

+ Details

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

X

- Definition

Net proceeds from underwriting shares after deducting underwriting discounts and commissions.

+ References

No definition available.

+ Details

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

X

- Definition

Settled on payment of outstanding principal and interest.

+ References

No definition available.

+ Details

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

X

- Definition

Underwritten offering shares.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3044-108585

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121566466&loc=d3e6676-107765

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_CashAndCashEquivalentsAtCarryingValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Sum of investments and unrestricted cash as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03.1,2)
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

+ Details

Name:	us-gaap_InvestmentsAndCash
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Receivables to be collected from (obligations owed to) related parties, net as of the balance sheet date where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(k)(1))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 850
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=6457730&loc=d3e39549-107864

+ Details

Name:	us-gaap_RelatedPartyTransactionDueFromToRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3291-108585

+ Details

Name:	us-gaap_RepaymentsOfDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Number of new stock issued during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21463-112644

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

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

X

- Details

Name:	us-gaap_StatementEquityComponentsAxis=us-gaap_CommonStockMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_SubsidiarySaleOfStockAxis=fcel_AtMarketIssuanceSalesAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_CounterpartyNameAxis=fcel_JefferiesLlcMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=fcel_EnbridgeIncMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_StatementClassOfStockAxis=fcel_SeriesOnePreferredSharesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=fcel_SrSecuredDebtMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DebtInstrumentAxis=fcel_LibertyBankPromissoryNoteMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: