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Stockholders' Equity and Stock Repurchase Program (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity and Stock Repurchase Program |
Schedule of changes in ownership interest in consolidated subsidiaries | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ |  | 2020 | ​ | 2019
Net income (loss) attributable to AXT, Inc. | ​ | $ | 3,238 |  | $ | (2,600)
Increase (decrease) in additional paid-in capital for: | ​ |  | ​ | ​ |  | ​
Sales of subsidiary shares to noncontrolling interest | ​ |  | 396 | ​ |  | —
Purchase of subsidiary shares from noncontrolling interest | ​ | ​ | (1,398) | ​ | ​ | (74)
Adjustment to noncontrolling interests in connection with the reorganization and alignment of assets under Tongmei | ​ | ​ | (10,732) | ​ | ​ | —
Net transfers to noncontrolling interests | ​ | ​ | (11,734) | ​ | ​ | (74)
Change from net income (loss) attributable to AXT, Inc., net of transfers to noncontrolling interest | ​ | $ | (8,496) | ​ | $ | (2,674)

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- Definition The tabular disclosure of the effects of any changes in a parent's ownership interest in a subsidiary on the equity attributable to the parent if the ownership interests in a subsidiary changes during the period. The changes represented by this element did not result in the deconsolidation of the subsidiary. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 50 -Paragraph 1A -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=109239629&loc=SL4573702-111684 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 810 -SubTopic 10 -Section 55 -Paragraph 4M -URI http://asc.fasb.org/extlink&oid=116874947&loc=SL4591554-111686 + Details
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