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Stockholders' Equity and Stock Repurchase Program - Ownership interest in consolidated subsidiaries (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stockholders' Equity and Stock Repurchase Program
Net income attributable to AXT, Inc.	$ (1,061)	$ 3,939	$ 3,901	$ 2,875	$ 3,134	$ 4,419	$ 1,930	$ 665	$ 9,654	$ 10,148	$ 5,636
Changes in paid-in capital for:
Sales of subsidiary shares to noncontrolling interest										1,765
Purchase of subsidiary shares from noncontrolling interest									187
Net transfers to noncontrolling interests									187	1,765
Net income attributable to AXT, Inc., net of transfers to noncontrolling interests									$ 9,841	$ 11,913

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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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The increase (decrease) 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 arise in a deconsolidation of the subsidiary from the consolidated financial statements.

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Represents the purchase by the parent of an additional equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The purchase of the additional equity interest represented by this element increases the parent's controlling interest in the subsidiary.

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Represents a sale by the parent of a portion of its equity interest in a subsidiary during the period, thereby effecting a change in total (consolidated) equity attributable to the parent. The sale of the equity interest represented by this element does not result in a loss of control by the parent.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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