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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended | 72 Months Ended |
--- | --- | --- | --- | ---
Mar. 31, 2022 | Mar. 31, 2021 | Dec. 31, 2015 | Dec. 31, 2021 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | $ 229,846 | $ 207,969 |  |  |
Common stock options exercised |  | 704 |  |  |
Stock-based compensation | 875 | 816 |  |  |
Investment in subsidiary with noncontrolling interest | (206) | (576) |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 10 |  |  |  |
Sale of common stock to employees in connection with the reorganization |  | 538 |  |  |
Tongmei stock-based compensation | 213 |  |  |  |
Net income (loss) | 3,554 | 3,736 |  |  |
Investment in subsidiary from noncontrolling interest | 1,887 |  |  |  |
Other comprehensive income (loss) | 372 | (147) |  |  |
Purchase of subsidiary shares from noncontrolling interests |  | (3,730) |  |  |
Balance, end of period | 236,551 | 210,462 |  | $ 229,846 |
Reclassification adjustment from AOCI | 0 | 0 |  |  |
Net income attributable to redeemable noncontrolling interests | 418 |  |  |  |
Other comprehensive income attributable to redeemable noncontrolling interests | $ 46 |  |  |  |
Stock repurchase program, authorized amount |  |  |  |  | $ 5,000
Shares repurchased (in shares) | 0 |  | 908,000 | 0 |
Average price of shares repurchased (in dollars per share) |  |  | $ 2.52 |  |
Total purchase price |  |  | $ 2,300 |  |
Stock repurchase program remaining authorized repurchase amount | $ 2,700 |  |  |  |
Preferred Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 3,532 | 3,532 |  |  |
Balance, end of period | 3,532 | 3,532 |  | $ 3,532 |
Common Stock |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 43 | 42 |  |  |
Balance, end of period | 43 | 42 |  | 43 |
Additional Paid-In Capital |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 231,622 | 230,381 |  |  |
Common stock options exercised |  | 704 |  |  |
Stock-based compensation | 875 | 816 |  |  |
Investment in subsidiary with noncontrolling interest | (410) | 131 |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 17 |  |  |  |
Sale of common stock to employees in connection with the reorganization |  | 538 |  |  |
Tongmei stock-based compensation | 213 |  |  |  |
Purchase of subsidiary shares from noncontrolling interests |  | (2,691) |  |  |
Balance, end of period | 232,317 | 229,617 |  | 231,622 |
Accumulated Deficit |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | (29,970) | (44,545) |  |  |
Net income (loss) | 3,165 | 3,425 |  |  |
Balance, end of period | (26,805) | (41,120) |  | (29,970) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 6,302 | 3,209 |  |  |
Other comprehensive income (loss) | 327 | (131) |  |  |
Balance, end of period | 6,629 | 3,078 |  | 6,302 |
AXT, Inc. Stockholders' Equity |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 211,529 | 192,619 |  |  |
Common stock options exercised |  | 704 |  |  |
Stock-based compensation | 875 | 816 |  |  |
Investment in subsidiary with noncontrolling interest | (410) | 131 |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | 17 |  |  |  |
Sale of common stock to employees in connection with the reorganization |  | 538 |  |  |
Tongmei stock-based compensation | 213 |  |  |  |
Net income (loss) | 3,165 | 3,425 |  |  |
Other comprehensive income (loss) | 327 | (131) |  |  |
Purchase of subsidiary shares from noncontrolling interests |  | (2,691) |  |  |
Balance, end of period | 215,716 | 195,149 |  | 211,529 |
Noncontrolling Interests |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Balance, beginning of period | 18,317 | 15,350 |  |  |
Investment in subsidiary with noncontrolling interest | 204 | (707) |  |  |
Noncontrolling interest portion of Tongmei stock-based compensation | (7) |  |  |  |
Net income (loss) | 389 | 311 |  |  |
Investment in subsidiary from noncontrolling interest | 1,887 |  |  |  |
Other comprehensive income (loss) | 45 | (16) |  |  |
Purchase of subsidiary shares from noncontrolling interests |  | (1,039) |  |  |
Balance, end of period | $ 20,835 | $ 15,313 |  | $ 18,317 |

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