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Summary of Significant Accounting Policies - Revenues - General Information (Details) | 6 Months Ended
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Jun. 30, 2024
Revenues [Abstract] |
Customer payment term, low end of range | 15 days
Customer payment term, high end of range | 60 days

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- Definition Customer Payment Term, High End of Range + References No definition available. + Details
Name: | fgi_CustomerPaymentTermHighEndOfRange
Namespace Prefix: | fgi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Customer Payment Term, Low End of Range + References No definition available. + Details
Name: | fgi_CustomerPaymentTermLowEndOfRange
Namespace Prefix: | fgi_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_RevenuesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration