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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, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Stockholders' Equity and Stock Repurchase Program
Net income attributable to AXT, Inc.	$ 3,134	$ 4,419	$ 1,930	$ 665	$ 2,214	$ 2,229	$ 1,151	$ 42	$ 10,148	$ 5,636	$ (2,228)
Changes in paid-in capital for:
Sales of subsidiary shares to noncontrolling interest									1,765
Net transfers to noncontrolling interests									1,765
Net income attributable to AXT, Inc., net of transfers to noncontrolling interests									$ 11,913	$ 5,636

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- Definition

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 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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