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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended 12 Months Ended 72 Months Ended
Sep. 30, 2022
Jun. 30, 2022
Mar. 31, 2022
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2015
Dec. 31, 2021
Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period $ 238,464 $ 236,551 $ 229,846 $ 217,262 $ 210,462 $ 207,969 $ 229,846 $ 207,969      
Common stock options exercised 371 146   468 420 704          
Investment in subsidiary with noncontrolling interest 789   (206)     (3,730)          
Investment in subsidiary with noncontrolling interest   1,179     575 576          
Noncontrolling interest portion of Tongmei stock-based compensation 16 16 10                
Stock-based compensation 921 919 875 1,639 975 816          
Tongmei stock-based compensation 115 218 213                
Transfer of subsidiary with redeemable noncontrolling interest         (1,241)            
Sale of common stock to employees in connection with the reorganization           538          
Investment in subsidiary from noncontrolling interest     1,887                
Net income (loss) 6,205 5,996 3,554 4,129 4,479 3,736          
Other comprehensive income (loss) (6,722) (6,561) 372 56 1,592 (147)          
Balance, end of period 240,159 238,464 236,551 223,554 217,262 210,462 240,159 223,554   $ 229,846  
Reclassification adjustment from AOCI 0     0     0 0      
Net income attributable to redeemable noncontrolling interests 525           1,492        
Other comprehensive income attributable to redeemable noncontrolling interests $ 635           $ 1,200        
Stock repurchase program, authorized amount                     $ 5,000
Shares repurchased (in shares) 0           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           $ 2,700        
Preferred Stock                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period 3,532 3,532 3,532 3,532 3,532 3,532 3,532 3,532      
Balance, end of period 3,532 3,532 3,532 3,532 3,532 3,532 3,532 3,532   $ 3,532  
Common Stock                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period 43 43 43 42 42 42 43 42      
Common stock options exercised       1              
Balance, end of period 43 43 43 43 42 42 43 43   43  
Additional Paid-In Capital                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period 233,364 232,317 231,622 228,411 229,617 230,381 231,622 230,381      
Common stock options exercised 371 146   467 420 704          
Investment in subsidiary with noncontrolling interest (259)   (410)     (2,691)          
Investment in subsidiary with noncontrolling interest   (268)     (131) (131)          
Noncontrolling interest portion of Tongmei stock-based compensation 20 32 17                
Stock-based compensation 921 919 875 1,639 975 816          
Tongmei stock-based compensation 115 218 213                
Transfer of subsidiary with noncontrolling interest         (1,229)            
Transfer of subsidiary with redeemable noncontrolling interest         (1,241)            
Sale of common stock to employees in connection with the reorganization           538          
Balance, end of period 234,532 233,364 232,317 230,517 228,411 229,617 234,532 230,517   231,622  
Accumulated Deficit                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period (21,259) (26,805) (29,970) (36,735) (41,120) (44,545) (29,970) (44,545)      
Net income (loss) 5,759 5,546 3,165 3,800 4,385 3,425          
Balance, end of period (15,500) (21,259) (26,805) (32,935) (36,735) (41,120) (15,500) (32,935)   (29,970)  
Accumulated Other Comprehensive Income (Loss)                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period 637 6,629 6,302 4,533 3,078 3,209 6,302 3,209      
Other comprehensive income (loss) (6,094) (5,992) 327 50 1,455 (131)          
Balance, end of period (5,457) 637 6,629 4,583 4,533 3,078 (5,457) 4,583   6,302  
AXT, Inc. Stockholders' Equity                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period 216,317 215,716 211,529 199,783 195,149 192,619 211,529 192,619      
Common stock options exercised 371 146   468 420 704          
Investment in subsidiary with noncontrolling interest (259)   (410)     (2,691)          
Investment in subsidiary with noncontrolling interest   (268)     (131) (131)          
Noncontrolling interest portion of Tongmei stock-based compensation 20 32 17                
Stock-based compensation 921 919 875 1,639 975 816          
Tongmei stock-based compensation 115 218 213                
Transfer of subsidiary with noncontrolling interest         (1,229)            
Transfer of subsidiary with redeemable noncontrolling interest         (1,241)            
Sale of common stock to employees in connection with the reorganization           538          
Net income (loss) 5,759 5,546 3,165 3,800 4,385 3,425          
Other comprehensive income (loss) (6,094) (5,992) 327 50 1,455 (131)          
Balance, end of period 217,150 216,317 215,716 205,740 199,783 195,149 217,150 205,740   211,529  
Noncontrolling Interests                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Balance, beginning of period 22,147 20,835 18,317 17,479 15,313 15,350 18,317 15,350      
Investment in subsidiary with noncontrolling interest 1,048   204     (1,039)          
Investment in subsidiary with noncontrolling interest   1,447     706 707          
Noncontrolling interest portion of Tongmei stock-based compensation (4) (16) (7)                
Transfer of subsidiary with noncontrolling interest         1,229            
Investment in subsidiary from noncontrolling interest     1,887                
Net income (loss) 446 450 389 329 94 311          
Other comprehensive income (loss) (628) (569) 45 6 137 (16)          
Balance, end of period $ 23,009 $ 22,147 $ 20,835 $ 17,814 $ 17,479 $ 15,313 $ 23,009 $ 17,814   $ 18,317