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Stockholders' Equity (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended 36 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2015
Dec. 31, 2018
Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period $ 194,532 $ 188,317      
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary (617)        
Common stock options exercised   66      
Stock-based compensation 558 467      
Net income (loss) (1,023) 3,190      
Other comprehensive income 2,531 2,699      
Balance, end of period 195,981 194,739   $ 194,532  
Reclassification adjustment from AOCI 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        
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 40 39      
Balance, end of period 40 39   40  
Additional Paid-In Capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 234,418 231,679      
Common stock options exercised   66      
Stock-based compensation 558 467      
Balance, end of period 234,976 232,212   234,418  
Accumulated Deficit          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period (45,183) (54,837)      
Net income (loss) (1,104) 2,875      
Balance, end of period (46,287) (51,962)   (45,183)  
Accumulated Other Comprehensive Income (Loss)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period (1,972) 3,407      
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary (1,150)        
Other comprehensive income 2,389 2,439      
Balance, end of period (733) 5,846   (1,972)  
AXT, Inc. Stockholders' Equity          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 190,835 183,820      
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary (1,150)        
Common stock options exercised   66      
Stock-based compensation 558 467      
Net income (loss) (1,104) 2,875      
Other comprehensive income 2,389 2,439      
Balance, end of period 191,528 189,667   190,835  
Noncontrolling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 3,697 4,497      
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary 533        
Net income (loss) 81 315      
Other comprehensive income 142 260      
Balance, end of period $ 4,453 $ 5,072   $ 3,697