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Net Income (Loss) Per Share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Numerator:      
Net income attributable to AXT, Inc $ 665,000 $ 42,000  
Less: Preferred stock dividends (44,000) (44,000)  
Net income (loss) available to common stockholders $ 621,000 $ (2,000)  
Denominator:      
Denominator for basic net income (loss) per share - weighted average common shares (in shares) 34,210,000 32,002,000  
Effect of dilutive securities:      
Denominator for dilutive net income (loss) per common share (in shares) 35,624,000 32,002,000  
Net income (loss) attributable to AXT, Inc. per common share:      
Basic (in dollars per share) $ 0.02 $ 0.00  
Diluted (in dollars per share) $ 0.02 $ 0.00  
Preferred stock, shares issued (in shares) 883,000   883,000
Preferred stock, shares outstanding (in shares) 883,000   883,000
Preferred stock, par value (in dollars per share) $ 0.001   $ 0.001
Preferred stock, value $ 3,532,000   $ 3,532,000
Cumulative annual dividend rate (as a percent) 5.00%   5.00%
Liquidation preference over common stock (in dollars per share) $ 4   $ 4
Options [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares) 639,000 3,313,000  
Restricted Stock Awards [Member]      
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)   339,000  
Options [Member]      
Effect of dilutive securities:      
Effect of dilutive securities (in shares) 1,220,000    
Restricted Stock Awards [Member]      
Effect of dilutive securities:      
Effect of dilutive securities (in shares) 194,000