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Summary of Significant Accounting Policies, Accounts Receivable (Details) - USD ($) | Dec. 31, 2024 | Dec. 31, 2023
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Accounts Receivable [Abstract] |  |
Reserves for uncollectible accounts | $ 10,000 | $ 2,000

X
- Definition The amount of reserves for uncollectible accounts. + References No definition available. + Details
Name: | femy_ReservesForUncollectibleAccounts
Namespace Prefix: | femy_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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