Summary of Significant Accounting Policies - Other Assets (Details) - USD ($)	Dec. 31, 2025	Dec. 31, 2024
Summary of Significant Accounting Policies [Abstract]
Prepaid and other current assets	$ 249,394	$ 315,897
Other long-term assets	698,898	714,912
Research tax credits available to the Company	$ 948,292	$ 1,030,809

Amount of noncurrent research tax credits classified as other.

No definition available.

Name:	femy_ResearchTaxCreditsNoncurrent
Namespace Prefix:	femy_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant