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Investments in Companies (Details) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  | 9 Months Ended |  | 9 Months Ended |  | 9 Months Ended |  |  |  |  |  |  |
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Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Sep. 30, 2013 USD ($) | Sep. 30, 2012 USD ($) | Dec. 31, 2012 USD ($) | Sep. 30, 2013 AXT, Inc. [Member] USD ($) | Sep. 30, 2012 AXT, Inc. [Member] USD ($) | Sep. 30, 2013 AXT, Inc. [Member] USD ($) | Sep. 30, 2012 AXT, Inc. [Member] USD ($) | Sep. 30, 2013 Equity Method Investments [Member] USD ($) | Sep. 30, 2012 Equity Method Investments [Member] USD ($) | Sep. 30, 2013 Equity Method Investments [Member] USD ($) | Sep. 30, 2012 Equity Method Investments [Member] USD ($) | Sep. 30, 2013 Equity Method Investments [Member] CNY | Dec. 31, 2012 Equity Method Investments [Member] USD ($) | Sep. 30, 2013 Majority-owned Subsidiaries [Member] USD ($) | Dec. 31, 2012 Majority-owned Subsidiaries [Member] USD ($) | Sep. 30, 2013 Beijing JiYa Semiconductor Material Co., Ltd [Member] Majority-owned Subsidiaries [Member] USD ($) | Dec. 31, 2012 Beijing JiYa Semiconductor Material Co., Ltd [Member] Majority-owned Subsidiaries [Member] USD ($) | Sep. 30, 2013 Nanjing Jin Mei Gallium Co., Ltd [Member] Majority-owned Subsidiaries [Member] USD ($) | Dec. 31, 2012 Nanjing Jin Mei Gallium Co., Ltd [Member] Majority-owned Subsidiaries [Member] USD ($) | Sep. 30, 2013 Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] Majority-owned Subsidiaries [Member] USD ($) | Dec. 31, 2012 Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] Majority-owned Subsidiaries [Member] USD ($) | Sep. 30, 2013 Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] Equity Method Investments [Member] USD ($) | Dec. 31, 2012 Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] Equity Method Investments [Member] USD ($) | Sep. 30, 2013 Xilingol Tongli Germanium Co. Ltd [Member] Equity Method Investments [Member] USD ($) | Dec. 31, 2012 Xilingol Tongli Germanium Co. Ltd [Member] Equity Method Investments [Member] USD ($) | Sep. 30, 2013 Emeishan Jia Mei High Purity Metals Co., Ltd [Member] Equity Method Investments [Member] USD ($) | Dec. 31, 2012 Emeishan Jia Mei High Purity Metals Co., Ltd [Member] Equity Method Investments [Member] USD ($)
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated |  |  |  |  |  |  |  |  |  | $ 460,000 |  | $ 460,000 |  | 2,800,000 |  | $ 4,333,000 | $ 4,333,000 | $ 3,331,000 | $ 3,331,000 | $ 592,000 | $ 592,000 | $ 410,000 | $ 410,000 |  |  |  |  |  |
Equity method investment by parent |  |  |  |  |  |  |  |  |  | 7,510,000 |  | 7,510,000 |  |  | 7,326,000 |  |  |  |  |  |  |  |  | 1,950,000 | 2,038,000 | 4,618,000 | 4,246,000 | 942,000 | 1,042,000
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46.00% |  | 83.00% |  | 70.00% |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) | 20.00% |  | 20.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 46.00% |  | 25.00% |  | 25.00% |
Number of consolidated joint ventures |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from three consolidated joint ventures |  |  |  |  |  |  |  |  |  | 565,000 | 1,800,000 | 3,300,000 | 7,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income allocated to minority interests | 230,000 | 512,000 | 1,105,000 | 2,957,000 |  |  |  |  |  | 230,000 | 512,000 | 1,100,000 | 3,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income from joint ventures attributable to parent |  |  |  |  |  |  |  |  |  | 335,000 | 1,200,000 | 2,200,000 | 4,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of equity investment entities |  |  |  |  |  |  |  |  |  | 3 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minority investment invested by consolidated joint venture, included in other assets |  |  |  |  |  |  |  |  |  | 3,100,000 |  | 3,100,000 |  |  | 2,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income | 346,000 | 348,000 | 1,099,000 | 786,000 |  |  |  |  |  | 346,000 | 348,000 | 1,100,000 | 786,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of Option Exercised to Sell Shares | 35.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in unconsolidated privately-held entities, included in other assets | 325,000 |  | 325,000 |  | 392,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net revenue |  |  |  |  |  | 11,024,000 | 9,394,000 | 29,938,000 | 23,676,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gross profit |  |  |  |  |  | 3,628,000 | 3,377,000 | 10,516,000 | 8,137,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating income |  |  |  |  |  | 2,393,000 | 2,018,000 | 6,566,000 | 4,542,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net income |  |  |  |  |  | $ 1,631,000 | $ 1,897,000 | $ 4,960,000 | $ 3,915,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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