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Stockholders’ Equity (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Oct. 27, 2014
Feb. 21, 2013
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period $ 137,561,000            
Stock-based compensation 253,000            
Net (loss) income (67,000) $ (899,000)          
Dividends declared by joint ventures (52,000)            
Other comprehensive income 327,000 (21,000)          
Balance, end of period 138,022,000   $ 137,561,000        
Reclassification adjustment from AOCI 0 $ 0          
Stock Repurchase Program [Abstract]              
Stock repurchase program, authorized amount           $ 5,000,000 $ 6,000,000
Shares repurchased (in shares)     908,000 0 285,000    
Average price of shares repurchased (in dollars per share)     $ 2.52   $ 2.51    
Total purchase price     $ 2,300,000   $ 716,000    
Stock repurchase program remaining authorized repurchase amount 2,700,000       $ 5,300,000    
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 $ 32,000            
Common stock options exercised            
Balance, end of period $ 32,000   32,000        
Additional Paid-In Capital              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period 194,646,000            
Stock-based compensation 253,000            
Balance, end of period 194,899,000   194,646,000        
Accumulated Deficit              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period (70,621,000)            
Net (loss) income 42,000            
Balance, end of period (70,579,000)   (70,621,000)        
Other Comprehensive Income              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period 4,382,000            
Other comprehensive income 283,000            
Balance, end of period 4,665,000   4,382,000        
AXT, Inc. Stockholders' Equity              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period 131,971,000            
Stock-based compensation 253,000            
Net (loss) income 42,000            
Other comprehensive income 283,000            
Balance, end of period 132,549,000   131,971,000        
Noncontrolling Interests              
Increase (Decrease) in Stockholders' Equity [Roll Forward]              
Balance, beginning of period 5,590,000            
Net (loss) income (109,000)            
Dividends declared by joint ventures (52,000)            
Other comprehensive income 44,000            
Balance, end of period $ 5,473,000   $ 5,590,000