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Stockholders' Equity and Warrant Liabilities - Schedule of Warrant Activity (Details) - Series C Warrants	Jan. 31, 2022 shares
Class of Warrant or Right, Outstanding	950,102
Class of Warrant or Right, Outstanding	950,102

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=fcel_SeriesCWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: