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Summary of Significant Accounting Policies - Schedule of Gross Carrying Amount of Capitalized Internally Developed Software Costs (Details) - USD ($)	Sep. 30, 2025	Dec. 31, 2024
Capitalized Computer Software, Net [Abstract]
Capitalized software not placed into service	$ 269,540	$ 348,058

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- Definition

Capitalized software not placed into service.

+ References

No definition available.

+ Details

Name:	fld_CapitalizedSoftwareNotPlacedIntoService
Namespace Prefix:	fld_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

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- References

No definition available.

+ Details

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