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Stockholders' Equity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Dec. 31, 2015
Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period $ 137,390,000        
Common stock options exercised 757,000        
Stock-based compensation 312,000        
Issuance of common stock, net of stock issuance costs of $2,246 31,918,000        
Net (loss) income 425,000 $ (67,000)      
Dividends declared by joint ventures (465,000)        
Other comprehensive income 352,000 327,000      
Balance, end of period 170,689,000   $ 137,390,000    
Reclassification adjustment from AOCI 0 $ 0      
Stock issuance cost 2,246,000        
Stock repurchase program, authorized amount         $ 5,000,000
Shares repurchased (in shares)     0 908,000  
Average price of shares repurchased (in dollars per share)       $ 2.52  
Total purchase price       $ 2,300,000  
Stock repurchase program remaining authorized repurchase amount 2,700,000        
Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 3,532,000        
Common stock options exercised        
Balance, end of period 3,532,000   $ 3,532,000    
Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 33,000        
Common stock options exercised 1,000        
Issuance of common stock, net of stock issuance costs of $2,246 5,000        
Balance, end of period 39,000   33,000    
Additional Paid-In Capital          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 194,177,000        
Common stock options exercised 756,000        
Stock-based compensation 312,000        
Issuance of common stock, net of stock issuance costs of $2,246 31,913,000        
Balance, end of period 227,158,000   194,177,000    
Accumulated Deficit          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period (64,985,000)        
Net (loss) income 665,000        
Balance, end of period (64,320,000)   (64,985,000)    
Other Comprehensive Income          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 253,000        
Other comprehensive income 297,000        
Balance, end of period 550,000   253,000    
AXT, Inc. Stockholders' Equity          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 133,010,000        
Common stock options exercised 757,000        
Stock-based compensation 312,000        
Issuance of common stock, net of stock issuance costs of $2,246 31,918,000        
Net (loss) income 665,000        
Other comprehensive income 297,000        
Balance, end of period 166,959,000   133,010,000    
Noncontrolling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Balance, beginning of period 4,380,000        
Net (loss) income (240,000)        
Dividends declared by joint ventures (465,000)        
Other comprehensive income 55,000        
Balance, end of period $ 3,730,000   $ 4,380,000