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Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended | 84 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2023 | Mar. 31, 2023 | Jun. 30, 2022 | Mar. 31, 2022 | Jun. 30, 2023 | Jun. 30, 2022 | Dec. 31, 2015 | Dec. 31, 2022 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 243,418,000 | $ 244,900,000 | $ 236,551,000 | $ 229,846,000 | $ 244,900,000 | $ 229,846,000 |  |  |
Common stock options exercised | 2,000 | 8,000 | 146,000 |  |  |  |  |  |
Investment in subsidiary with noncontrolling interest | 306,000 | 203,000 | 1,179,000 | (206,000) |  |  |  |  |
Investment in subsidiary with redeemable noncontrolling interest | (75,000) | (36,000) |  |  | (111,000) |  |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 17,000 | 17,000 | 16,000 | 10,000 |  |  |  |  |
Stock-based compensation | 720,000 | 717,000 | 919,000 | 875,000 |  |  |  |  |
Tongmei stock-based compensation | 192,000 | 198,000 | 218,000 | 213,000 |  |  |  |  |
Investment in subsidiary from noncontrolling interest |  |  |  | 1,887,000 |  |  |  |  |
Net income (loss) | (5,051,000) | (3,517,000) | 5,996,000 | 3,554,000 |  |  |  |  |
Other comprehensive income (loss) | (6,538,000) | 928,000 | (6,561,000) | 372,000 |  |  |  |  |
Balance, end of period | 232,991,000 | 243,418,000 | 238,464,000 | 236,551,000 | 232,991,000 | 238,464,000 |  | $ 244,900,000 |
Reclassification adjustment from AOCI | 0 |  | 0 |  | 0 | 0 |  |  |
Net income (loss) attributable to redeemable noncontrolling interests | (302,000) |  | 549,000 |  | (451,000) | 967,000 |  |  |
Other comprehensive loss attributable to redeemable noncontrolling interests | $ (630,000) |  | (575,000) |  | $ (560,000) | (529,000) |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  | $ 5,000,000.0
Shares repurchased (in shares) | 0 |  |  |  | 0 |  | 908,000 | 0 |
Average price of shares repurchased (in dollars per share) |  |  |  |  |  |  | $ 2.52 |  |
Total purchase price |  |  |  |  |  |  | $ 2,300,000 |  |
Stock repurchase program remaining authorized repurchase amount | $ 2,700,000 |  |  |  | $ 2,700,000 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 3,532,000 | 3,532,000 | 3,532,000 | 3,532,000 | 3,532,000 | 3,532,000 |  |  |
Balance, end of period | 3,532,000 | 3,532,000 | 3,532,000 | 3,532,000 | 3,532,000 | 3,532,000 |  | $ 3,532,000 |
Common Stock |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 44,000 | 44,000 | 43,000 | 43,000 | 44,000 | 43,000 |  |  |
Balance, end of period | 44,000 | 44,000 | 43,000 | 43,000 | 44,000 | 43,000 |  | 44,000 |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 236,192,000 | 235,308,000 | 232,317,000 | 231,622,000 | 235,308,000 | 231,622,000 |  |  |
Common stock options exercised | 2,000 | 8,000 | 146,000 |  |  |  |  |  |
Investment in subsidiary with noncontrolling interest | (74,000) | (36,000) | (268,000) | (410,000) |  |  |  |  |
Investment in subsidiary with redeemable noncontrolling interest | (75,000) | (36,000) |  |  |  |  |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 31,000 | 33,000 | 32,000 | 17,000 |  |  |  |  |
Stock-based compensation | 720,000 | 717,000 | 919,000 | 875,000 |  |  |  |  |
Tongmei stock-based compensation | 192,000 | 198,000 | 218,000 | 213,000 |  |  |  |  |
Balance, end of period | 236,988,000 | 236,192,000 | 233,364,000 | 232,317,000 | 236,988,000 | 233,364,000 |  | 235,308,000 |
Accumulated Deficit |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | (17,507,000) | (14,159,000) | (26,805,000) | (29,970,000) | (14,159,000) | (29,970,000) |  |  |
Net income (loss) | (5,089,000) | (3,348,000) | 5,546,000 | 3,165,000 |  |  |  |  |
Balance, end of period | (22,596,000) | (17,507,000) | (21,259,000) | (26,805,000) | (22,596,000) | (21,259,000) |  | (14,159,000) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | (2,260,000) | (3,118,000) | 6,629,000 | 6,302,000 | (3,118,000) | 6,302,000 |  |  |
Other comprehensive income (loss) | (5,915,000) | 858,000 | (5,992,000) | 327,000 |  |  |  |  |
Balance, end of period | (8,175,000) | (2,260,000) | 637,000 | 6,629,000 | (8,175,000) | 637,000 |  | (3,118,000) |
AXT, Inc. Stockholders' Equity |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 220,001,000 | 221,607,000 | 215,716,000 | 211,529,000 | 221,607,000 | 211,529,000 |  |  |
Common stock options exercised | 2,000 | 8,000 | 146,000 |  |  |  |  |  |
Investment in subsidiary with noncontrolling interest | (74,000) | (36,000) | (268,000) | (410,000) |  |  |  |  |
Investment in subsidiary with redeemable noncontrolling interest | (75,000) | (36,000) |  |  |  |  |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 31,000 | 33,000 | 32,000 | 17,000 |  |  |  |  |
Stock-based compensation | 720,000 | 717,000 | 919,000 | 875,000 |  |  |  |  |
Tongmei stock-based compensation | 192,000 | 198,000 | 218,000 | 213,000 |  |  |  |  |
Net income (loss) | (5,089,000) | (3,348,000) | 5,546,000 | 3,165,000 |  |  |  |  |
Other comprehensive income (loss) | (5,915,000) | 858,000 | (5,992,000) | 327,000 |  |  |  |  |
Balance, end of period | 209,793,000 | 220,001,000 | 216,317,000 | 215,716,000 | 209,793,000 | 216,317,000 |  | 221,607,000 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 23,417,000 | 23,293,000 | 20,835,000 | 18,317,000 | 23,293,000 | 18,317,000 |  |  |
Investment in subsidiary with noncontrolling interest | 380,000 | 239,000 | 1,447,000 | 204,000 |  |  |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | (14,000) | (16,000) | (16,000) | (7,000) |  |  |  |  |
Investment in subsidiary from noncontrolling interest |  |  |  | 1,887,000 |  |  |  |  |
Net income (loss) | 38,000 | (169,000) | 450,000 | 389,000 |  |  |  |  |
Other comprehensive income (loss) | (623,000) | 70,000 | (569,000) | 45,000 |  |  |  |  |
Balance, end of period | $ 23,198,000 | $ 23,417,000 | $ 22,147,000 | $ 20,835,000 | $ 23,198,000 | $ 22,147,000 |  | $ 23,293,000 |

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