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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended | 60 Months Ended |
--- | --- | --- | --- | --- | ---
Sep. 30, 2021 | Jun. 30, 2021 | Mar. 31, 2021 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2015 | Dec. 31, 2020 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 217,262 | $ 210,462 | $ 207,969 | $ 194,054 | $ 192,190 | $ 192,762 | $ 207,969 | $ 192,762 |  |  |
Common stock options exercised | 468 | 420 | 704 | 624 | 72 | 441 |  |  |  |  |
Stock-based compensation | 1,639 | 975 | 816 | 648 | 641 | 643 |  |  |  |  |
Formation of new subsidiary with noncontrolling interests |  | 575 | 576 | 396 |  |  |  |  |  |  |
Sale of common stock to employees in connection with the reorganization |  |  | 538 |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (3,730) |  |  |  |  |  |  |  |
Transfer of subsidiary with redeemable noncontrolling interest |  | (1,241) |  |  |  |  |  |  |  |  |
Net income (loss) | 4,129 | 4,479 | 3,736 | 1,481 |  |  |  |  |  |  |
Net income (loss) | 4,496 |  |  | 1,481 | 959 | 217 | 12,876 | 2,657 |  |  |
Net dividend declared by joint ventures |  |  |  |  | (89) |  |  |  |  |  |
Other comprehensive income (loss) | 56 | 1,592 | (147) | 4,689 | 281 | (1,873) |  |  |  |  |
Balance, end of period | 223,554 | 217,262 | 210,462 | 201,892 | 194,054 | 192,190 | 223,554 | 201,892 |  | $ 207,969 |
Reclassification adjustment from AOCI | 0 |  |  | 0 |  |  | 0 | 0 |  |  |
Stock repurchase program, authorized amount |  |  |  |  |  |  |  |  |  |  | $ 5,000
Shares repurchased (in shares) |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  | 2,700 |  |  |  |
Preferred Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 |  |  |
Balance, end of period | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 | 3,532 |  | $ 3,532 |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 42 | 42 | 42 | 41 | 41 | 41 | 42 | 41 |  |  |
Common stock options exercised | 1 |  |  |  |  |  |  |  |  |  |
Balance, end of period | 43 | 42 | 42 | 41 | 41 | 41 | 43 | 41 |  | 42 |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 228,411 | 229,617 | 230,381 | 238,754 | 238,041 | 236,957 | 230,381 | 236,957 |  |  |
Common stock options exercised | 467 | 420 | 704 | 624 | 72 | 441 |  |  |  |  |
Stock-based compensation | 1,639 | 975 | 816 | 648 | 641 | 643 |  |  |  |  |
Formation of new subsidiary with noncontrolling interests |  | (131) | (131) | 396 |  |  |  |  |  |  |
Sale of common stock to employees in connection with the reorganization |  |  | 538 |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (2,691) |  |  |  |  |  |  |  |
Transfer of subsidiary with noncontrolling interest |  | (1,229) |  |  |  |  |  |  |  |  |
Transfer of subsidiary with redeemable noncontrolling interest |  | (1,241) |  |  |  |  |  |  |  |  |
Balance, end of period | 230,517 | 228,411 | 229,617 | 240,422 | 238,754 | 238,041 | 230,517 | 240,422 |  | 230,381 |
Accumulated Deficit |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | (36,735) | (41,120) | (44,545) | (47,600) | (47,961) | (47,783) | (44,545) | (47,783) |  |  |
Net income (loss) | 3,800 | 4,385 | 3,425 | 991 |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 361 | (178) |  |  |  |  |
Balance, end of period | (32,935) | (36,735) | (41,120) | (46,609) | (47,600) | (47,961) | (32,935) | (46,609) |  | (44,545) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 4,533 | 3,078 | 3,209 | (6,365) | (6,637) | (4,862) | 3,209 | (4,862) |  |  |
Other comprehensive income (loss) | 50 | 1,455 | (131) | 4,373 | 272 | (1,775) |  |  |  |  |
Balance, end of period | 4,583 | 4,533 | 3,078 | (1,992) | (6,365) | (6,637) | 4,583 | (1,992) |  | 3,209 |
AXT, Inc. Stockholders' Equity |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 199,783 | 195,149 | 192,619 | 188,362 | 187,016 | 187,885 | 192,619 | 187,885 |  |  |
Common stock options exercised | 468 | 420 | 704 | 624 | 72 | 441 |  |  |  |  |
Stock-based compensation | 1,639 | 975 | 816 | 648 | 641 | 643 |  |  |  |  |
Formation of new subsidiary with noncontrolling interests |  | (131) | (131) | 396 |  |  |  |  |  |  |
Sale of common stock to employees in connection with the reorganization |  |  | 538 |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (2,691) |  |  |  |  |  |  |  |
Transfer of subsidiary with noncontrolling interest |  | (1,229) |  |  |  |  |  |  |  |  |
Transfer of subsidiary with redeemable noncontrolling interest |  | (1,241) |  |  |  |  |  |  |  |  |
Net income (loss) | 3,800 | 4,385 | 3,425 | 991 |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 361 | (178) |  |  |  |  |
Other comprehensive income (loss) | 50 | 1,455 | (131) | 4,373 | 272 | (1,775) |  |  |  |  |
Balance, end of period | 205,740 | 199,783 | 195,149 | 195,394 | 188,362 | 187,016 | 205,740 | 195,394 |  | 192,619 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |  |  |
Balance, beginning of period | 17,479 | 15,313 | 15,350 | 5,692 | 5,174 | 4,877 | 15,350 | 4,877 |  |  |
Formation of new subsidiary with noncontrolling interests |  | 706 | 707 |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (1,039) |  |  |  |  |  |  |  |
Transfer of subsidiary with noncontrolling interest |  | 1,229 |  |  |  |  |  |  |  |  |
Net income (loss) | 329 | 94 | 311 | 490 |  |  |  |  |  |  |
Net income (loss) |  |  |  |  | 598 | 395 |  |  |  |  |
Net dividend declared by joint ventures |  |  |  |  | (89) |  |  |  |  |  |
Other comprehensive income (loss) | 6 | 137 | (16) | 316 | 9 | (98) |  |  |  |  |
Balance, end of period | $ 17,814 | $ 17,479 | $ 15,313 | $ 6,498 | $ 5,692 | $ 5,174 | $ 17,814 | $ 6,498 |  | $ 15,350 |

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