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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended 72 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2015
Dec. 31, 2021
Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period $ 229,846 $ 207,969      
Common stock options exercised   704      
Stock-based compensation 875 816      
Investment in subsidiary with noncontrolling interest (206) (576)      
Noncontrolling interest portion of Tongmei stock-based compensation 10        
Sale of common stock to employees in connection with the reorganization   538      
Tongmei stock-based compensation 213        
Net income (loss) 3,554 3,736      
Investment in subsidiary from noncontrolling interest 1,887        
Other comprehensive income (loss) 372 (147)      
Purchase of subsidiary shares from noncontrolling interests   (3,730)      
Balance, end of period 236,551 210,462   $ 229,846  
Reclassification adjustment from AOCI 0 0      
Net income attributable to redeemable noncontrolling interests 418        
Other comprehensive income attributable to redeemable noncontrolling interests $ 46        
Stock repurchase program, authorized amount         $ 5,000
Shares repurchased (in shares) 0   908,000 0  
Average price of shares repurchased (in dollars per share)     $ 2.52    
Total purchase price     $ 2,300    
Stock repurchase program remaining authorized repurchase amount $ 2,700        
Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 3,532 3,532      
Balance, end of period 3,532 3,532   $ 3,532  
Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 43 42      
Balance, end of period 43 42   43  
Additional Paid-In Capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 231,622 230,381      
Common stock options exercised   704      
Stock-based compensation 875 816      
Investment in subsidiary with noncontrolling interest (410) 131      
Noncontrolling interest portion of Tongmei stock-based compensation 17        
Sale of common stock to employees in connection with the reorganization   538      
Tongmei stock-based compensation 213        
Purchase of subsidiary shares from noncontrolling interests   (2,691)      
Balance, end of period 232,317 229,617   231,622  
Accumulated Deficit          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period (29,970) (44,545)      
Net income (loss) 3,165 3,425      
Balance, end of period (26,805) (41,120)   (29,970)  
Accumulated Other Comprehensive Income (Loss)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 6,302 3,209      
Other comprehensive income (loss) 327 (131)      
Balance, end of period 6,629 3,078   6,302  
AXT, Inc. Stockholders' Equity          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 211,529 192,619      
Common stock options exercised   704      
Stock-based compensation 875 816      
Investment in subsidiary with noncontrolling interest (410) 131      
Noncontrolling interest portion of Tongmei stock-based compensation 17        
Sale of common stock to employees in connection with the reorganization   538      
Tongmei stock-based compensation 213        
Net income (loss) 3,165 3,425      
Other comprehensive income (loss) 327 (131)      
Purchase of subsidiary shares from noncontrolling interests   (2,691)      
Balance, end of period 215,716 195,149   211,529  
Noncontrolling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 18,317 15,350      
Investment in subsidiary with noncontrolling interest 204 (707)      
Noncontrolling interest portion of Tongmei stock-based compensation (7)        
Net income (loss) 389 311      
Investment in subsidiary from noncontrolling interest 1,887        
Other comprehensive income (loss) 45 (16)      
Purchase of subsidiary shares from noncontrolling interests   (1,039)      
Balance, end of period $ 20,835 $ 15,313   $ 18,317