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Investments in Privately Held Companies - Minority Investment Entities (Details) - USD ($) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015
AXT, Inc. Stockholders' Equity |  |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |
Net Revenue | $ 7,760,000 | $ 11,004,000 | $ 11,276,000 | $ 20,329,000
Gross profit | (629,000) | 3,625,000 | (579,000) | 5,920,000
Operating income (loss) | (1,676,000) | 2,292,000 | (2,860,000) | 3,343,000
Net income (loss) | (1,644,000) | 1,784,000 | (3,418,000) | 2,741,000
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 (loss) | $ (400,000) | $ 410,000 | $ (856,000) | $ 610,000

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