v3.26.1
Document And Entity Information - USD ($)
 12 Months Ended
Dec. 31, 2025
Mar. 02, 2026
Jun. 30, 2025
Document Information [Line Items]      
Entity Central Index Key 0001051627    
Entity Registrant Name AXT INC    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2025    
Document Type 10-K    
Document Annual Report true    
Document Period End Date Dec. 31, 2025    
Document Transition Report false    
Entity File Number 000-24085    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 94-3031310    
Entity Address, Address Line One 4281 Technology Drive    
Entity Address, City or Town Fremont    
Entity Address, State or Province CA    
Entity Address, Postal Zip Code 94538    
City Area Code 510    
Local Phone Number 438-4700    
Title of 12(b) Security Common Stock, $0.001 par value    
Trading Symbol AXTI    
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    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Entity Shell Company false    
Entity Public Float     $ 83,786,290
Entity Common Stock, Shares Outstanding   55,573,599  
Auditor Firm ID 207    
Auditor Name BPM LLP    
Auditor Location San Jose, California