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v3.3.1.900

Investments in Privately-held Companies, Minority Investment Entities (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
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 | $ 36,259,000 | $ 47,824,000 | $ 41,257,000
Gross profit | 8,327,000 | 21,436,000 | 13,836,000
Operating income | 2,494,000 | 9,046,000 | 8,174,000
Net income | 2,371,000 | 6,765,000 | 6,315,000
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 | 43,000 | 569,000 | 270,000
Summarized balance sheet information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Current assets | 32,097,000 | 31,482,000 |
Noncurrent assets | 35,917,000 | 39,275,000 |
Current liabilities | 18,185,000 | 19,923,000 |
Noncurrent liabilities | 571,000 | 169,000 |
Minority Investment Entities [Member] |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Net Revenue | 9,112,000 | 11,887,000 | 10,240,000
Gross profit | 1,954,000 | 5,340,000 | 3,328,000
Operating income | 494,000 | 2,059,000 | 1,820,000
Net income | 462,000 | 1,528,000 | 1,377,000
Minority investment entities |  |  |
Dividends received | 305,000 | 327,000 | $ 396,000
Undistributed retained earnings | $ 6,600,000 | $ 6,500,000 |

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