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Stockholders' Equity (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 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     1,523,000        
Stock-based compensation     961,000        
Issuance of common stock, net of stock issuance costs of $2,246     31,861,000        
Net income (loss) $ 4,565,000 $ 2,211,000 6,788,000 $ 2,942,000      
Dividends declared by joint ventures     (465,000)        
Other comprehensive income 1,162,000 (345,000) 2,359,000 (2,054,000)      
Balance, end of period 180,417,000   180,417,000   $ 137,390,000    
Reclassification adjustment from AOCI 0 $ 0 0 $ 0      
Stock issuance cost     2,639,000        
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   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   $ 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   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     1,522,000        
Stock-based compensation     961,000        
Issuance of common stock, net of stock issuance costs of $2,246     31,856,000        
Balance, end of period 228,516,000   228,516,000   194,177,000    
Accumulated Deficit              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period     (64,985,000)        
Net income (loss)     7,014,000        
Balance, end of period (57,971,000)   (57,971,000)   (64,985,000)    
Accumulated Other Comprehensive Income              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period     253,000        
Other comprehensive income     2,022,000        
Balance, end of period 2,275,000   2,275,000   253,000    
AXT, Inc. Stockholders' Equity              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period     133,010,000        
Common stock options exercised     1,523,000        
Stock-based compensation     961,000        
Issuance of common stock, net of stock issuance costs of $2,246     31,861,000        
Net income (loss)     7,014,000        
Other comprehensive income     2,022,000        
Balance, end of period 176,391,000   176,391,000   133,010,000    
Noncontrolling Interests              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period     4,380,000        
Net income (loss)     (226,000)        
Dividends declared by joint ventures     (465,000)        
Other comprehensive income     337,000        
Balance, end of period $ 4,026,000   $ 4,026,000   $ 4,380,000