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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)
shares in Thousands, $ in Thousands
Preferred Stock
Common Stock
Additional Paid-In Capital
Accumulated Deficit
Accumulated Other Comprehensive Income (Loss)
AXT, Inc. Stockholders' Equity
Noncontrolling Interests
Total
Balance, beginning of period at Dec. 31, 2021 $ 3,532 $ 43 $ 231,622 $ (29,970) $ 6,302 $ 211,529 $ 18,317 $ 229,846
Balance (in shares) at Dec. 31, 2021 883 42,886            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised   $ 1 517     518   518
Common stock options exercised (in shares)   172            
Investment in subsidiary with noncontrolling interest     (466)     (466) 2,699 2,233
Investment in subsidiary with redeemable noncontrolling interest     471     471   471
Restricted stock awards canceled (in shares)   (91)            
Stock-based compensation     3,273     3,273   3,273
Issuance of common stock in the form of restricted stock (in shares)   587            
Tongmei stock-based compensation     733     733   733
Noncontrolling interest portion of Tongmei stock-based compensation     100     100 (42) 58
Investment in subsidiary from noncontrolling interest             1,887 1,887
Net income (loss)       15,811   15,811 1,333 17,144
Other comprehensive loss         (9,420) (9,420) (901) (10,321)
Balance, end of period at Dec. 31, 2022 $ 3,532 $ 44 235,308 (14,159) (3,118) 221,607 23,293 244,900
Balance (in shares) at Dec. 31, 2022 883 43,554            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised     10     10   10
Common stock options exercised (in shares)   4            
Investment in subsidiary with noncontrolling interest     (153)     (153) 861 708
Investment in subsidiary with redeemable noncontrolling interest     155     155   155
Restricted stock awards canceled (in shares)   (23)            
Stock-based compensation     2,779     2,779   2,779
Issuance of common stock in the form of restricted stock (in shares)   704            
Tongmei stock-based compensation     761     761   761
Noncontrolling interest portion of Tongmei stock-based compensation     (98)     (98) 55 (43)
Net income (loss)       (17,881)   (17,881) (391) (18,272)
Other comprehensive loss         (2,881) (2,881) (324) (3,205)
Balance, end of period at Dec. 31, 2023 $ 3,532 $ 44 238,452 (32,040) (5,999) 203,989 23,494 227,483
Balance (in shares) at Dec. 31, 2023 883 44,239            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised   $ 1 27     28   28
Common stock options exercised (in shares)   12            
Restricted stock awards canceled (in shares)   (6)            
Stock-based compensation     2,647     2,647   2,647
Issuance of common stock in the form of restricted stock (in shares)   1,113            
Tongmei stock-based compensation     450     450   450
Noncontrolling interest portion of Tongmei stock-based compensation     (62)     (62) 31 (31)
Net income (loss)       (11,624)   (11,624) 342 (11,282)
Other comprehensive loss         (2,658) (2,658) (306) (2,964)
Balance, end of period at Dec. 31, 2024 $ 3,532 $ 45 $ 241,514 $ (43,664) $ (8,657) $ 192,770 $ 23,561 $ 216,331
Balance (in shares) at Dec. 31, 2024 883 45,358