| Cover | Sep. 15, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Sep. 15, 2021 |
| Entity File Number | 001-33624 |
| Entity Registrant Name | SINTX Technologies, Inc. |
| Entity Central Index Key | 0001269026 |
| Entity Tax Identification Number | 84-1375299 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1885 West 2100 South |
| Entity Address, City or Town | Salt Lake City |
| Entity Address, State or Province | UT |
| Entity Address, Postal Zip Code | 84119 |
| City Area Code | (801) |
| Local Phone Number | 839-3500 |
| Written Communications | false |
| Soliciting Material | true |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | SINT |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
