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Investments in Privately-held Companies (Details) (USD $) | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Summary of investments [Abstract] |  |  |
Income allocated to minority interests | $ 3,040,000 | $ 5,503,000 | $ 1,723,000
Equity investments classified as other assets | 14,275,000 | 14,101,000 |
AXT, Inc [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 5,665,000 | 2,900,000 | 973,000
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Net Sales | 32,858,000 | 21,340,000 | 13,009,000
Gross profit | 11,057,000 | 7,576,000 | 3,697,000
Operating income | 6,310,000 | 3,819,000 | 899,000
Net income | 5,665,000 | 2,900,000 | 973,000
Equity Method Investments [Member] |  |  |
Summary of investments [Abstract] |  |  |
Equity Method Investment by Parent | 7,326,000 | 7,049,000 |
Number of consolidated joint ventures | 3 |  |
Income from three consolidated joint ventures | 7,400,000 | 12,500,000 | 5,300,000
Income allocated to minority interests | 3,040,000 | 5,503,000 | 1,723,000
Net income from joint ventures attributable to parent | 4,400,000 | 7,000,000 | 3,600,000
Number of equity investment entities | 3 |  | 2
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 379,000 | 520,000 | 259,000
Net income generated by all joint ventures, consolidated and equity method investments | 4,700,000 | 7,600,000 | 3,800,000
Equity investments classified as other assets | 7,300,000 | 7,000,000 |
Minority investment in consolidated joint venture, included in other assets | 2,000,000 | 1,300,000 |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Net income | 379,000 | 520,000 | 259,000
Joint Ventures [Member] |  |  |
Summary of investments [Abstract] |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 1,281,000 | 741,000 | 259,000
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Net Sales | 8,091,000 | 5,196,000 | 3,252,000
Gross profit | 2,643,000 | 1,814,000 | 924,000
Operating income | 1,409,000 | 863,000 | 225,000
Net income | 1,281,000 | 741,000 | 259,000
Summarized balance sheet information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |
Current assets | 20,594,000 | 17,392,000 |
Noncurrent assets | 37,555,000 | 33,778,000 |
Current Liabilities | 20,772,000 | 16,708,000 |
Noncurrent liabilities | 2,873,000 | 3,806,000 |
Minority investment entities |  |  |
Dividends received | 277,000 | 357,000 | 0
Undistributed retained earnings | 4,300,000 | 3,300,000 |
Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 4,333,000 | 1,998,000 |
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member] |  |  |
Summary of investments [Abstract] |  |  |
Investments, consolidated | 3,331,000 | 996,000 |
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 | 410,000 | 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 | 4,246,000 | 3,881,000 |
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 | 2,038,000 | 2,167,000 |
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 | $ 1,042,000 | $ 1,001,000 |
Percentage of ownership, equity method (in hundredths) | 25.00% |  |

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