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Document And Entity Information
 6 Months Ended
Jun. 30, 2025
Document Information [Line Items]  
Document Type S-3
Entity Registrant Name AXT, Inc.
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
Entity Filer Category Non-accelerated Filer
Entity Small Business true
Entity Emerging Growth Company false
Entity Central Index Key 0001051627
Amendment Flag false