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Investments in Privately-held Companies (Details) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
Summary of investments [Abstract] |  |  |
Income allocated to minority interests | $ 1,145,000 | $ 3,040,000 | $ 5,503,000
Equity investments classified as other assets | 14,801,000 | 14,275,000 |
AXT, Inc [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 6,315,000 | 5,665,000 | 2,900,000
Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity Method Investment by Parent | 7,537,000 | 7,326,000 |
Number of equity investment entities | 3 | 3 |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 270,000 | 379,000 | 520,000
Net income generated by all joint ventures, consolidated and equity method investments | 2,600,000 | 4,700,000 | 7,600,000
Equity investments classified as other assets | 7,500,000 | 7,300,000 |
Minority investment in consolidated joint venture, included in other assets | 3,400,000 | 2,000,000 |
Joint Ventures [Member] |  |  |
Summary of investments [Abstract] |  |  |
Number of consolidated joint ventures | 3 | 3 | 3
Income from three consolidated joint ventures | 3,500,000 | 7,400,000 | 12,500,000
Income allocated to minority interests | 1,100,000 | 3,000,000 | 5,500,000
Net income from joint ventures attributable to parent | 2,400,000 | 4,400,000 | 7,000,000
Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 5,269,000 | 4,333,000 |
Minority Investment Entities [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 1,377,000 | 1,281,000 | 741,000
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 3,331,000 | 3,331,000 |
Percentage of ownership, consolidated method (in hundredths) | 46.00% |  |
Nanjing Jin Mei Gallium Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 592,000 | 592,000 |
Percentage of ownership, consolidated method (in hundredths) | 83.00% |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 1,346,000 | 410,000 |
Percentage of ownership, consolidated method (in hundredths) | 70.00% |  |
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity Method Investment by Parent | 4,692,000 | 4,246,000 |
Percentage of ownership, equity method (in hundredths) | 25.00% |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity Method Investment by Parent | 1,900,000 | 2,038,000 |
Percentage of ownership, equity method (in hundredths) | 46.00% |  |
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity Method Investment by Parent | $ 945,000 | $ 1,042,000 |
Percentage of ownership, equity method (in hundredths) | 25.00% |  |

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