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Net Income (Loss) per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Numerator:      
Net income (loss) attributable to AXT, Inc. $ (11,624) $ (17,881) $ 15,811
Less: Preferred stock dividends (177) (177) (177)
Net income (loss) available to common stockholders $ (11,801) $ (18,058) $ 15,634
Denominator:      
Denominator for basic net income (loss) per share - weighted-average common shares 43,154 42,643 42,104
Effect of dilutive securities:      
Denominator for dilutive net income (loss) per common shares 43,154 42,643 42,715
Net income (loss) attributable to AXT, Inc. per common share:      
Basic $ (0.27) $ (0.42) $ 0.37
Diluted $ (0.27) $ (0.42) $ 0.37
Common stock options      
Effect of dilutive securities:      
Effect of dilutive securities (in shares)     333
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) 1,175 1,198 220
Restricted Stock Awards      
Effect of dilutive securities:      
Effect of dilutive securities (in shares)     278
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) 1,842 1,258 291