Summary of Significant Accounting Policies, Clinical Holdback (Details) - USD ($)	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022
Clinical Holdback Liability [Roll Forward]
Balance	$ 141,864	$ 168,738
Clinical holdback retained	5,900	21,456
Clinical holdback paid	(27,529)	(48,330)
Balance	120,235	141,864
Less: clinical holdback - current portion	(65,300)	(45,206)
Clinical holdback - long-term portion	$ 54,935	$ 96,658
Minimum [Member]
Clinical Holdback [Abstract]
Agreed percentage of invoiced costs retains	5.00%
Maximum [Member]
Clinical Holdback [Abstract]
Agreed percentage of invoiced costs retains	15.00%

The agreed upon percentage of total invoiced costs retains from the medical institution or physician.

No definition available.

Name:	femy_AgreedPercentageOfInvoicedCostsRetains
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Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant

No definition available.

Name:	femy_ClinicalHoldbackAbstract
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Amount of clinical holdback expected to be paid during the following twelve months or within one business cycle, if longer.

No definition available.

Name:	femy_ClinicalHoldbackCurrent
Namespace Prefix:	femy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of clinical holdback liability.

No definition available.

Name:	femy_ClinicalHoldbackLiability
Namespace Prefix:	femy_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

No definition available.

Name:	femy_ClinicalHoldbackLiabilityRollForward
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Data Type:	xbrli:stringItemType
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Period Type:	duration

Amount of clinical holdback, due after one year or beyond the normal operating cycle, if longer.

No definition available.

Name:	femy_ClinicalHoldbackNoncurrent
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount of cash outflow reducing clinical holdback liability.

No definition available.

Amount of clinical holdback retained during the period.

No definition available.

Name:	femy_ClinicalHoldbackRetained
Namespace Prefix:	femy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
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Balance Type:
Period Type:

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: