| Document and Entity Information | Feb. 28, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Feb. 28, 2024 |
| Entity File Number | 001-40492 |
| Entity Registrant Name | Femasys Inc. |
| Entity Central Index Key | 0001339005 |
| Entity Incorporation, State or Country Code | DE |
| Entity Tax Identification Number | 11-3713499 |
| Entity Address, Address Line One | 3950 Johns Creek Court |
| Entity Address, Address Line Two | Suite 100 |
| Entity Address, City or Town | Suwanee |
| Entity Address, State or Province | GA |
| Entity Address, Postal Zip Code | 30024 |
| City Area Code | 770 |
| Local Phone Number | 500-3910 |
| Title of 12(b) Security | Common Stock, par value $0.001 per share |
| Trading Symbol | FEMY |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Entity Ex Transition Period | true |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
