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Net Income (Loss) Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Numerator:      
Net income attributable to AXT, Inc. $ 3,165 $ 3,425  
Less: Preferred stock dividends (44) (44)  
Net income available to common stockholders $ 3,121 $ 3,381  
Weighted-average number of common shares outstanding:      
Denominator for basic net income (loss) per share - weighted-average common shares 41,871,000 41,004,000  
Effect of dilutive securities:      
Denominator for dilutive net income per common shares 42,662,000 42,726,000  
Net income attributable to AXT,Inc. per common share:      
Basic $ 0.07 $ 0.08  
Diluted $ 0.07 $ 0.08  
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   $ 3,532
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) 201,000 21,000  
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) 218,000 57,000  
Options [Member]      
Effect of dilutive securities:      
Effect of dilutive securities (in shares) 474,000 1,082,000  
Restricted Stock Awards [Member]      
Effect of dilutive securities:      
Effect of dilutive securities (in shares) 317,000 640,000