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v3.23.1

Stockholders' Equity (Details) - USD ($) | 3 Months Ended | 12 Months Ended | 84 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2023 | Mar. 31, 2022 | Dec. 31, 2015 | Dec. 31, 2022 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 244,900,000 | $ 229,846,000 |  |  |
Common stock options exercised | 8,000 |  |  |  |
Investment in subsidiary with noncontrolling interest | 203,000 | (206,000) |  |  |
Investment in subsidiary with redeemable noncontrolling interest | (36,000) |  |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 17,000 | 10,000 |  |  |
Stock-based compensation | 717,000 | 875,000 |  |  |
Tongmei stock-based compensation | 198,000 | 213,000 |  |  |
Investment in subsidiary from noncontrolling interest |  | 1,887,000 |  |  |
Net income (loss) | (3,517,000) | 3,554,000 |  |  |
Other comprehensive income | 928,000 | 372,000 |  |  |
Balance, end of period | 243,418,000 | 236,551,000 |  | $ 244,900,000 |
Reclassification adjustment from AOCI | 0 | 0 |  |  |
Net income (loss) attributable to redeemable noncontrolling interests | (149,000) | 418,000 |  |  |
Other comprehensive income attributable to redeemable noncontrolling interests | $ 70,000 | 46,000 |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 5,000,000.0
Shares repurchased (in shares) | 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 |  |  |  |
Preferred Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 3,532,000 | 3,532,000 |  |  |
Balance, end of period | 3,532,000 | 3,532,000 |  | $ 3,532,000 |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 44,000 | 43,000 |  |  |
Balance, end of period | 44,000 | 43,000 |  | 44,000 |
Additional Paid-In Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 235,308,000 | 231,622,000 |  |  |
Common stock options exercised | 8,000 |  |  |  |
Investment in subsidiary with noncontrolling interest | (36,000) | (410,000) |  |  |
Investment in subsidiary with redeemable noncontrolling interest | (36,000) |  |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 33,000 | 17,000 |  |  |
Stock-based compensation | 717,000 | 875,000 |  |  |
Tongmei stock-based compensation | 198,000 | 213,000 |  |  |
Balance, end of period | 236,192,000 | 232,317,000 |  | 235,308,000 |
Accumulated Deficit |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (14,159,000) | (29,970,000) |  |  |
Net income (loss) | (3,348,000) | 3,165,000 |  |  |
Balance, end of period | (17,507,000) | (26,805,000) |  | (14,159,000) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (3,118,000) | 6,302,000 |  |  |
Other comprehensive income | 858,000 | 327,000 |  |  |
Balance, end of period | (2,260,000) | 6,629,000 |  | (3,118,000) |
AXT, Inc. Stockholders' Equity |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 221,607,000 | 211,529,000 |  |  |
Common stock options exercised | 8,000 |  |  |  |
Investment in subsidiary with noncontrolling interest | (36,000) | (410,000) |  |  |
Investment in subsidiary with redeemable noncontrolling interest | (36,000) |  |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 33,000 | 17,000 |  |  |
Stock-based compensation | 717,000 | 875,000 |  |  |
Tongmei stock-based compensation | 198,000 | 213,000 |  |  |
Net income (loss) | (3,348,000) | 3,165,000 |  |  |
Other comprehensive income | 858,000 | 327,000 |  |  |
Balance, end of period | 220,001,000 | 215,716,000 |  | 221,607,000 |
Noncontrolling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 23,293,000 | 18,317,000 |  |  |
Investment in subsidiary with noncontrolling interest | 239,000 | 204,000 |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | (16,000) | (7,000) |  |  |
Investment in subsidiary from noncontrolling interest |  | 1,887,000 |  |  |
Net income (loss) | (169,000) | 389,000 |  |  |
Other comprehensive income | 70,000 | 45,000 |  |  |
Balance, end of period | $ 23,417,000 | $ 20,835,000 |  | $ 23,293,000 |

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