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Cover
 12 Months Ended
Dec. 31, 2025
shares
Document Information [Line Items]  
Document Type 20-F
Document Registration Statement false
Document Annual Report true
Document Transition Report false
Document Financial Statement Error Correction [Flag] false
Document Shell Company Report false
Entity Interactive Data Current Yes
Document Accounting Standard U.S. GAAP
ICFR Auditor Attestation Flag false
Amendment Flag false
Document Period End Date Dec. 31, 2025
Document Fiscal Year Focus 2025
Document Fiscal Period Focus FY
Entity Information [Line Items]  
Entity Registrant Name SAIHEAT Limited
Entity Central Index Key 0001847075
Entity File Number 001-40368
Entity Incorporation, State or Country Code E9
Current Fiscal Year End Date --12-31
Entity Well-known Seasoned Issuer No
Entity Voluntary Filers No
Entity Current Reporting Status Yes
Entity Shell Company false
Entity Filer Category Non-accelerated Filer
Entity Emerging Growth Company true
Entity Ex Transition Period false
Entity Contact Personnel [Line Items]  
Entity Address, Address Line One c/o #266A South Bridge Road
Entity Address, City or Town Singapore
Entity Address, Country SG
Entity Address, Postal Zip Code 058815
Ordinary Shares, par value $0.0015 per share  
Entity Listings [Line Items]  
Title of 12(b) Security Ordinary Shares, par value $0.0015 per share
Trading Symbol SAIH
Security Exchange Name NASDAQ
Warrants exercisable to purchase Ordinary Shares  
Entity Listings [Line Items]  
Title of 12(b) Security Warrants exercisable to purchase Ordinary Shares
Trading Symbol SAIHTW
Security Exchange Name NASDAQ
Class A Ordinary Shares  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 1,190,317
Class B Ordinary Shares  
Entity Listings [Line Items]  
Entity Common Stock, Shares Outstanding 642,043
Business Contact [Member]  
Entity Contact Personnel [Line Items]  
Contact Personnel Name Jianwei Li
Entity Address, Address Line One c/o #266A South Bridge Road
Entity Address, City or Town Singapore
Entity Address, Country SG
Entity Address, Postal Zip Code 058815
Entity Phone Fax Numbers [Line Items]  
City Area Code +65
Local Phone Number 9656 5641