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v3.25.1

Summary of Significant Accounting Policies, Leases (Details) | 12 Months Ended
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Dec. 31, 2024
Leases [Abstract] |
Minimum term to record operating leases as right-to-use assets and operating lease liabilities | 1 year
Minimum term to record finance leases as right-to-use assets and finance lease liabilities | 1 year

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- Definition Minimum term to record finance leases as right-to-use assets and finance lease liabilities in, 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | femy_MinimumTermToRecordFinanceLeasesAsRightToUseAssetsAndFinanceLeaseLiabilities
Namespace Prefix: | femy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- Definition Minimum term to record operating leases as right-to-use assets and operating lease liabilities, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References No definition available. + Details
Name: | femy_MinimumTermToRecordOperatingLeasesAsRightToUseAssetsAndOperatingLeaseLiabilities
Namespace Prefix: | femy_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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