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Net Income (Loss) Per Share - Reconciliation of basic and diluted net income (loss) per share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Numerator:        
Net income (loss) attributable to AXT, Inc. $ (5,823) $ 5,759 $ (14,260) $ 14,470
Less: Preferred stock dividends (44) (44) (132) (132)
Net income (loss) available to common stockholders $ (5,867) $ 5,715 $ (14,392) $ 14,338
Denominator:        
Denominator for basic net income (loss) per share - weighted-average common shares 42,638 42,163 42,574 42,011
Effect of dilutive securities:        
Denominator for dilutive net income (loss) per common shares 42,638 42,982 42,574 42,718
Net income (loss) attributable to AXT, Inc. per common share:        
Basic $ (0.14) $ 0.14 $ (0.34) $ 0.34
Diluted $ (0.14) $ 0.13 $ (0.34) $ 0.34
Common stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares)   440   399
Net income (loss) attributable to AXT, Inc. per common share:        
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)   184   201
Restricted stock awards        
Effect of dilutive securities:        
Effect of dilutive securities (in shares)   379   308
Net income (loss) attributable to AXT, Inc. per common share:        
Securities excluded from diluted net income (loss) per share as the impact is anti-dilutive (in shares)   69   202