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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 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Numerator:        
Net income (loss) attributable to AXT, Inc. $ (5,089) $ 5,546 $ (8,437) $ 8,711
Less: Preferred stock dividends (44) (44) (88) (88)
Net income (loss) available to common stockholders $ (5,133) $ 5,502 $ (8,525) $ 8,623
Denominator:        
Denominator for basic net income (loss) per share - weighted-average common shares 42,586 42,001 42,542 41,935
Effect of dilutive securities:        
Denominator for dilutive net income (loss) per common shares 42,586 42,511 42,542 42,586
Net income (loss) attributable to AXT, Inc. per common share:        
Basic $ (0.12) $ 0.13 $ (0.20) $ 0.21
Diluted $ (0.12) $ 0.13 $ (0.20) $ 0.20
Common stock options        
Effect of dilutive securities:        
Effect of dilutive securities (in shares)   284   379
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) 1,200 392 1,200 220
Restricted stock awards        
Effect of dilutive securities:        
Effect of dilutive securities (in shares)   226   272
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) 1,019 362 1,019 352