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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended 60 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Jun. 30, 2020
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2015
Dec. 31, 2020
Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Balance, beginning of period $ 210,462 $ 207,969 $ 192,190 $ 192,762 $ 207,969 $ 192,762      
Common stock options exercised 420 704 72 441          
Stock-based compensation 975 816 641 643          
Formation of new subsidiary with noncontrolling interests 575 576              
Sale of common stock to employees in connection with the reorganization   538              
Purchase of subsidiary shares from noncontrolling interest   (3,730)              
Transfer of subsidiary with redeemable noncontrolling interest (1,241)                
Net income (loss) 4,479 3,736              
Net income (loss) 4,615   959 217 8,380 1,176      
Net dividend declared by joint ventures     (89)            
Other comprehensive income (loss) 1,592 (147) 281 (1,873)          
Balance, end of period 217,262 210,462 194,054 192,190 217,262 194,054   $ 207,969  
Reclassification adjustment from AOCI 0   0   0 0      
Stock repurchase program, authorized amount                 $ 5,000
Shares repurchased (in shares)             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      
Balance, end of period 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 42 42 41 41 42 41      
Balance, end of period 42 42 41 41 42 41   42  
Additional Paid-In Capital                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Balance, beginning of period 229,617 230,381 238,041 236,957 230,381 236,957      
Common stock options exercised 420 704 72 441          
Stock-based compensation 975 816 641 643          
Formation of new subsidiary with noncontrolling interests (131) (131)              
Sale of common stock to employees in connection with the reorganization   538              
Purchase of subsidiary shares from noncontrolling interest   (2,691)              
Transfer of subsidiary with noncontrolling interest (1,229)                
Transfer of subsidiary with redeemable noncontrolling interest (1,241)                
Balance, end of period 228,411 229,617 238,754 238,041 228,411 238,754   230,381  
Accumulated Deficit                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Balance, beginning of period (41,120) (44,545) (47,961) (47,783) (44,545) (47,783)      
Net income (loss) 4,385 3,425              
Net income (loss)     361 (178)          
Balance, end of period (36,735) (41,120) (47,600) (47,961) (36,735) (47,600)   (44,545)  
Accumulated Other Comprehensive Income (Loss)                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Balance, beginning of period 3,078 3,209 (6,637) (4,862) 3,209 (4,862)      
Other comprehensive income (loss) 1,455 (131) 272 (1,775)          
Balance, end of period 4,533 3,078 (6,365) (6,637) 4,533 (6,365)   3,209  
AXT, Inc. Stockholders' Equity                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Balance, beginning of period 195,149 192,619 187,016 187,885 192,619 187,885      
Common stock options exercised 420 704 72 441          
Stock-based compensation 975 816 641 643          
Formation of new subsidiary with noncontrolling interests (131) (131)              
Sale of common stock to employees in connection with the reorganization   538              
Purchase of subsidiary shares from noncontrolling interest   (2,691)              
Transfer of subsidiary with noncontrolling interest (1,229)                
Transfer of subsidiary with redeemable noncontrolling interest (1,241)                
Net income (loss) 4,385 3,425              
Net income (loss)     361 (178)          
Other comprehensive income (loss) 1,455 (131) 272 (1,775)          
Balance, end of period 199,783 195,149 188,362 187,016 199,783 188,362   192,619  
Noncontrolling Interests                  
Increase (Decrease) in Stockholders' Equity [Roll Forward]                  
Balance, beginning of period 15,313 15,350 5,174 4,877 15,350 4,877      
Formation of new subsidiary with noncontrolling interests 706 707              
Purchase of subsidiary shares from noncontrolling interest   (1,039)              
Transfer of subsidiary with noncontrolling interest 1,229                
Net income (loss) 94 311              
Net income (loss)     598 395          
Net dividend declared by joint ventures     (89)            
Other comprehensive income (loss) 137 (16) 9 (98)          
Balance, end of period $ 17,479 $ 15,313 $ 5,692 $ 5,174 $ 17,479 $ 5,692   $ 15,350