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Investments in Privately Held Companies - Minority Investment Entities (Details) | 12 Months Ended
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Dec. 31, 2017 USD ($) entity | Dec. 31, 2017 USD ($) company | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |  |
Net (loss) income |  |  | $ (900,000) | $ (1,200,000) | $ (43,000)
Minority investment entities |  |  |  |  |
Minority investments not consolidated accounted for under equity method | 7 | 7 |  |  |
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 |  |  | 6,152,000 | 6,124,000 | 9,007,000
Gross profit (loss) |  |  | 482,000 | (511,000) | 1,975,000
Operating loss |  |  | (938,000) | (1,724,000) | 588,000
Net (loss) income |  |  | (1,381,000) | (1,891,000) | 558,000
Seven Minority Investments |  |  |  |  |
Minority investment entities |  |  |  |  |
Entity income (loss) excluding impairment |  |  | (1,400,000) | (2,000,000) | 462,000
Minority Investment Entities |  |  |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |  |
Net revenue |  |  | 24,053,000 | 23,266,000 | 35,732,000
Gross profit (loss) |  |  | 1,739,000 | (2,191,000) | 8,429,000
Operating loss |  |  | (3,676,000) | (6,869,000) | 2,965,000
Net (loss) income |  |  | (4,798,000) | (7,428,000) | 2,850,000
Summarized balance sheet information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |  |
Current assets | $ 33,415,000 | $ 33,415,000 | 33,415,000 | 31,672,000 |
Noncurrent assets | 28,964,000 | 28,964,000 | 28,964,000 | 29,701,000 |
Current liabilities | 27,274,000 | 27,274,000 | 27,274,000 | 23,412,000 |
Noncurrent liabilities | $ 180,000 | $ 180,000 | 180,000 | 406,000 |
Minority investment entities |  |  |  |  |
Dividends received |  |  | 0 | 0 | $ 305,000
Undistributed retained earnings |  |  | $ 3,600,000 | $ 4,900,000 |

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