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Stockholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended | 48 Months Ended |
--- | --- | --- | --- | --- | ---
Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2019 | Mar. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2015 | Dec. 31, 2019 | Oct. 27, 2014
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | $ 192,190 | $ 192,762 | $ 195,981 | $ 194,532 | $ 192,762 | $ 194,532 |  |  |
Common stock options exercised | 72 | 441 | 232 |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (413) |  |  |  |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary |  |  |  | (617) |  | (617) |  |  |
Stock-based compensation | 641 | 643 | 568 | 558 |  |  |  |  |
Net income | 959 | 217 | 1,738 | (1,023) | 1,176 | 715 |  |  |
Net dividend declared by joint ventures | (89) |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 281 | (1,873) | (2,451) | 2,531 |  |  |  |  |
Balance, end of period | 194,054 | 192,190 | 195,655 | 195,981 | 194,054 | 195,655 |  | $ 192,762 |
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 |  |  |
Balance, end of period | 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 | 41 | 41 | 40 | 40 | 41 | 40 |  |  |
Balance, end of period | 41 | 41 | 40 | 40 | 41 | 40 |  | 41 |
Additional Paid-In Capital |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 238,041 | 236,957 | 234,976 | 234,418 | 236,957 | 234,418 |  |  |
Common stock options exercised | 72 | 441 | 232 |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (74) |  |  |  |  |  |
Stock-based compensation | 641 | 643 | 568 | 558 |  |  |  |  |
Balance, end of period | 238,754 | 238,041 | 235,702 | 234,976 | 238,754 | 235,702 |  | 236,957 |
Accumulated Deficit |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | (47,961) | (47,783) | (46,287) | (45,183) | (47,783) | (45,183) |  |  |
Net income | 361 | (178) | 1,451 | (1,104) |  |  |  |  |
Balance, end of period | (47,600) | (47,961) | (44,836) | (46,287) | (47,600) | (44,836) |  | (47,783) |
Accumulated Other Comprehensive Income (Loss) |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | (6,637) | (4,862) | (733) | (1,972) | (4,862) | (1,972) |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary |  |  |  | (1,150) |  |  |  |  |
Other comprehensive income (loss) | 272 | (1,775) | (2,397) | 2,389 |  |  |  |  |
Balance, end of period | (6,365) | (6,637) | (3,130) | (733) | (6,365) | (3,130) |  | (4,862) |
AXT, Inc. Stockholders' Equity |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 187,016 | 187,885 | 191,528 | 190,835 | 187,885 | 190,835 |  |  |
Common stock options exercised | 72 | 441 | 232 |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (74) |  |  |  |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary |  |  |  | (1,150) |  |  |  |  |
Stock-based compensation | 641 | 643 | 568 | 558 |  |  |  |  |
Net income | 361 | (178) | 1,451 | (1,104) |  |  |  |  |
Other comprehensive income (loss) | 272 | (1,775) | (2,397) | 2,389 |  |  |  |  |
Balance, end of period | 188,362 | 187,016 | 191,308 | 191,528 | 188,362 | 191,308 |  | 187,885 |
Noncontrolling Interests |  |  |  |  |  |  |  |  |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |  |
Balance, beginning of period | 5,174 | 4,877 | 4,453 | 3,697 | 4,877 | 3,697 |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | (339) |  |  |  |  |  |
Reclassification out of accumulated other comprehensive income and non-controlling interest upon the deconsolidation of a subsidiary |  |  |  | 533 |  |  |  |  |
Net income | 598 | 395 | 287 | 81 |  |  |  |  |
Net dividend declared by joint ventures | (89) |  |  |  |  |  |  |  |
Other comprehensive income (loss) | 9 | (98) | (54) | 142 |  |  |  |  |
Balance, end of period | $ 5,692 | $ 5,174 | $ 4,347 | $ 4,453 | $ 5,692 | $ 4,347 |  | $ 4,877 |

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