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Unaudited Quarterly Consolidated Financial Data (Details) - USD ($) $ / shares in Units, $ 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
Unaudited Quarterly Consolidated Financial Data
Revenue	$ 22,232	$ 28,626	$ 27,120	$ 24,419	$ 26,332	$ 28,168	$ 23,557	$ 20,616	$ 102,397	$ 98,673	$ 81,349
Gross Profit	5,850	10,614	11,010	9,573	9,798	11,133	7,256	6,288	37,047	34,475	26,381
Net income (loss) 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
Net income (loss) attributable to AXT, Inc. per share, basic (in dollar per share)	$ (0.03)	$ 0.10	$ 0.10	$ 0.07	$ 0.08	$ 0.11	$ 0.05	$ 0.02	$ 0.24	$ 0.27	$ 0.17
Net income (loss) attributable to AXT, Inc. per share, diluted (in dollar per share)	$ (0.03)	$ 0.10	$ 0.10	$ 0.07	$ 0.08	$ 0.11	$ 0.05	$ 0.02	$ 0.24	$ 0.26	$ 0.17

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