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Stockholders' Equity and Stock Repurchase Program - Ownership Interest in Consolidated Subsidiaries (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stockholders' Equity and Stock Repurchase Program
Net income attributable to AXT, Inc.	$ (11,624)	$ (17,881)	$ 15,811
Decrease in additional paid-in capital for:
Investment in subsidiary with noncontrolling interest		(308)
Change from net loss attributable to AXT, Inc., net of transfers to noncontrolling interests	$ (11,624)	$ (18,189)

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The amount of increase (decrease) in additional paid in capital for investment in subsidiary with noncontrolling interest .

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This element represents the total net income attributable to the parent for the period and the effect of net changes during the period impacting the parent's ownership interest in a subsidiary as it relates to the total (consolidated) equity attributable to the parent. The changes to the parent's ownership interest in a subsidiary represented by this element did not result in a deconsolidation of the subsidiary from the consolidated financial statements.

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