| Cover | Jun. 08, 2023 | Jun. 17, 2022 |
| Cover [Abstract] | ||
| Document Type | 8-K | |
| Document Period End Date | Jun. 08, 2023 | |
| Entity Registrant Name | MANNATECH, INCORPORATED | |
| Entity Incorporation, State or Country Code | TX | |
| Entity File Number | 000-24657 | |
| Entity Tax Identification Number | 75-2508900 | |
| Written Communications | false | |
| Soliciting Material | false | |
| Pre-commencement Tender Offer | false | |
| Pre-commencement Issuer Tender Offer | false | |
| Title of 12(b) Security | Common Stock, | |
| Trading Symbol | MTEX | |
| Security Exchange Name | NASDAQ | |
| Entity Emerging Growth Company | false | |
| Amendment Flag | false | |
| Entity Central Index Key | 0001056358 | |
| Entity Address, Address Line One | 1410 Lakeside Parkway, Suite 200 | |
| Entity Address, City or Town | Flower Mound | |
| Entity Address, State or Province | TX | |
| Entity Address, Postal Zip Code | 75028 | |
| City Area Code | (972) | |
| Local Phone Number | 471-7400 |
