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Investments in Privately Held Companies - Minority Investment Entities (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Net income (loss) | $ (1,200,000) | $ (43,000) | $ 569,000
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 | 6,441,000 | 9,112,000 | 11,887,000
Gross (loss) profit | (542,000) | 1,954,000 | 5,340,000
Operating (loss) income | (1,828,000) | 494,000 | 2,059,000
Net income (loss) | (1,995,000) | 462,000 | 1,528,000
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 | 24,851,000 | 36,259,000 | 47,824,000
Gross (loss) profit | (2,344,000) | 8,327,000 | 21,436,000
Operating (loss) income | (7,388,000) | 2,494,000 | 9,046,000
Net income (loss) | (7,947,000) | 2,371,000 | 6,765,000
Summarized balance sheet information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Current assets | 32,210,000 | 32,097,000 |
Noncurrent assets | 31,770,000 | 35,917,000 |
Current liabilities | 24,449,000 | 18,185,000 |
Noncurrent liabilities | 406,000 | 571,000 |
Minority investment entities |  |  |
Dividends received | 0 | 305,000 | $ 327,000
Undistributed retained earnings | $ 4,700,000 | $ 6,600,000 |

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