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Investments in Privately-held Companies, Minority Investment Entities (Details) - USD ($) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014
AXT, Inc. Stockholders' Equity [Member] |  |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |
Net Revenue | $ 9,631,000 | $ 11,487,000 | $ 29,960,000 | $ 38,433,000
Gross profit | 2,324,000 | 5,371,000 | 8,244,000 | 17,458,000
Operating income | 829,000 | 2,289,000 | 4,172,000 | 8,377,000
Net income | 805,000 | 1,759,000 | 3,546,000 | 6,485,000
Equity Method Investments [Member] |  |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |
Net income | $ 167,000 | $ 390,000 | $ 777,000 | $ 1,500,000

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