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Investments in Privately Held Companies (Details) | 3 Months Ended | 9 Months Ended |  |  |
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Sep. 30, 2016 USD ($) | Sep. 30, 2015 USD ($) item | Sep. 30, 2016 USD ($) employee entity | Sep. 30, 2015 USD ($) item | Sep. 30, 2016 employee | Sep. 30, 2016 item | Sep. 30, 2016 entity | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($) | Sep. 30, 2015 entity
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  |  |  | $ 7,025,000 | $ 7,948,000 |
Income allocated to minority interests | $ (18,000) | $ 5,000 | $ (480,000) | $ 257,000 |  |  |  |  |  |
Equity investments classified as other assets |  |  |  |  |  |  |  | 12,084,000 | 14,114,000 |
Gross equity earnings from minority-owned joint ventures that are not consolidated, recorded as other income | (2,416,000) | $ 805,000 | (5,834,000) | $ 3,546,000 |  |  |  |  |  |
Investments in unconsolidated privately-held entities, included in other assets |  |  |  |  |  |  |  | 3 |  |
Joint Ventures [Member] |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Number of consolidated joint ventures |  | 3 |  | 3 |  | 3 | 3 |  |  | 3
Income from three consolidated joint ventures | 399,000 | $ 459,000 | (82,000) | $ 1,700,000 |  |  |  |  |  |
Income allocated to minority interests | (18,000) | 5,000 | (480,000) | 257,000 |  |  |  |  |  |
Net income from joint ventures attributable to parent | $ 417,000 | 454,000 | $ 398,000 | 1,400,000 |  |  |  |  |  |
Minority investments | entity |  |  | 4 |  |  |  |  |  |  |
Other Assets [Member] |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  |  |  | 10,500,000 | 12,100,000 |
Equity investments classified as other assets |  |  |  |  |  |  |  | 7,000,000 | 7,900,000 |
Other Assets [Member] | Joint Ventures [Member] |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Minority investment in consolidated joint venture, included in other assets |  |  |  |  |  |  |  | 3,500,000 | 4,100,000 |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments, consolidated |  |  |  |  |  |  |  | 3,331,000 | 3,331,000 |
Percentage of ownership, consolidated method (in hundredths) |  |  | 46.00% |  |  |  |  |  |  |
Employee duration |  |  | 27 years |  |  |  |  |  |  |
Number of persons on board | employee |  |  |  |  | 1 |  |  |  |  |
Nanjing Jin Mei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments, consolidated |  |  |  |  |  |  |  | 592,000 | 592,000 |
Percentage of ownership, consolidated method (in hundredths) |  |  | 83.00% |  |  |  |  |  |  |
Number of new board representatives | employee |  |  | 2 |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments, consolidated |  |  |  |  |  |  |  | 1,346,000 | 1,346,000 |
Percentage of ownership, consolidated method (in hundredths) |  |  | 70.00% |  |  |  |  |  |  |
Number of new board representatives | employee |  |  | 2 |  |  |  |  |  |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  |  |  | 1,534,000 | 1,524,000 |
Percentage of ownership, equity method (in hundredths) | 46.00% |  | 46.00% |  |  |  |  |  |  |
Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  |  |  | 4,421,000 | 5,343,000 |
Percentage of ownership, equity method (in hundredths) | 25.00% |  | 25.00% |  |  |  |  |  |  |
Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  |  |  | 1,070,000 | 1,081,000 |
Percentage of ownership, equity method (in hundredths) | 25.00% |  | 25.00% |  |  |  |  |  |  |
Seven Minority Investments |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Gross equity earnings from minority-owned joint ventures that are not consolidated, recorded as other income | $ (581,000) | $ 167,000 | $ (1,400,000) | $ 777,000 |  |  |  |  |  |
Minority investments not consolidated accounted for under equity method | entity |  |  | 7 |  |  |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Minority investments | entity |  |  | 3 |  |  |  |  |  |  |
Jinmei [Member] |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Minority investments | entity |  |  | 1 |  |  |  |  |  |  |
Majority-Owned Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |
Investments, consolidated |  |  |  |  |  |  |  | $ 5,269,000 | $ 5,269,000 |

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