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Cover - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 13, 2026
Jun. 30, 2025
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2025    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Current Fiscal Year End Date --12-31    
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    
Title of 12(b) Security Common Stock, $0.01 par value    
Trading Symbol SINT    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 7,651,741
Entity Common Stock, Shares Outstanding   4,121,727  
Documents Incorporated By Reference None    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Listing, Par Value Per Share $ 0.01    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheets of SINTX Technologies, Inc. and subsidiaries (the “Company”) as of December 31, 2025 and 2024, the related consolidated statements of operations, stockholders’ equity, and cash flows for each of the years in the two-year period ended December 31, 2025, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2025 and 2024, and the results of its operations and its cash flows for each of the years in the two-year period ended December 31, 2025, in conformity with accounting principles generally accepted in the United States of America.    
Auditor Name TANNER LLP    
Auditor Firm ID 270    
Auditor Location Lehi, Utah