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Investments in Privately Held Companies (Details) |  | 2 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 02, 2017 USD ($) | Dec. 31, 2017 USD ($) subsidiary item | Dec. 31, 2017 USD ($) subsidiary item | Dec. 31, 2017 USD ($) employee subsidiary entity item | Dec. 31, 2016 USD ($) entity item | Dec. 31, 2015 USD ($) item | Mar. 31, 2017 USD ($)
Summary of investments [Abstract] |  |  |  |  |  |  |
Direct investments | item |  |  |  | 6 |  |  |
Indirect investments | item |  |  |  | 4 |  |  |
Investments in privately-held companies |  | $ 5,578,000 | $ 5,578,000 | $ 5,578,000 | $ 6,599,000 |  |
Number of consolidated joint ventures | subsidiary |  | 3 | 3 | 3 |  |  |
Net loss attributable to noncontrolling interests |  |  |  | $ (87,000) | (670,000) | $ (305,000) |
Net Income Loss From Consolidated Joint Ventures And Equity Method Investees Attributable To Parent |  |  |  |  |  | 1,100,000 |
Net income |  |  |  | $ (900,000) | $ (1,200,000) | $ (43,000) |
Direct minority investments not consolidated | entity |  |  |  | 3 | 3 |  |
Impaired entities | entity |  |  |  | 1 |  |  |
Joint Ventures |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Number of consolidated joint ventures | item |  | 3 | 3 | 3 | 3 | 3 |
Income (loss) from consolidated joint ventures |  |  |  | $ 2,100,000 | $ 100,000 | $ 800,000 |
Net loss attributable to noncontrolling interests |  |  |  | (100,000) | (700,000) | (300,000) |
Net income (loss) from joint ventures attributable to parent |  |  |  | 2,200,000 | 800,000 | $ 1,200,000 |
Net Income Loss From Consolidated Joint Ventures And Equity Method Investees Attributable To Parent |  |  |  | 1,300,000 | (400,000) |  |
Other assets |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | $ 9,800,000 | $ 9,800,000 | 9,800,000 | 11,300,000 |  |
Other assets | Joint Ventures |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Value of indirectly owned minority investments in privately-held companies |  | 4,300,000 | 4,300,000 | 4,300,000 | 4,700,000 |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments, consolidated |  | 3,331,000 | 3,331,000 | $ 3,331,000 | 3,331,000 |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  | 46.00% |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments, consolidated |  | 592,000 | 592,000 | $ 592,000 | 592,000 |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  | 83.00% |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments, consolidated |  | $ 1,346,000 | $ 1,346,000 | $ 1,346,000 | 1,346,000 |  |
Percentage of ownership, consolidated method (in hundredths) |  | 70.00% | 63.00% | 63.00% |  |  |
Investment gain | $ 0 |  |  |  |  |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | $ 1,473,000 | $ 1,473,000 | $ 1,473,000 | 1,498,000 |  |
Percentage of ownership, equity method (in hundredths) |  | 46.00% | 46.00% | 46.00% |  |  |
Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | $ 3,190,000 | $ 3,190,000 | $ 3,190,000 | 4,000,000 |  |
Percentage of ownership, equity method (in hundredths) |  | 25.00% | 25.00% | 25.00% |  |  |
Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | $ 915,000 | $ 915,000 | $ 915,000 | 1,101,000 |  |
Percentage of ownership, equity method (in hundredths) |  | 25.00% | 25.00% | 25.00% |  |  |
One Gallium Company |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  |  | $ 0
Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Indirect investments | entity |  |  |  | 3 |  |  |
Number of new board representatives | employee |  |  |  | 1 |  |  |
Employee duration |  |  |  | 27 years |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Number of new board representatives | employee |  |  |  | 2 |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd | 3rd party investor |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments, consolidated | $ 2,000,000 |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) | 10.00% |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Number of new board representatives | employee |  |  |  | 2 |  |  |
Majority-Owned Subsidiaries |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments, consolidated |  | $ 5,269,000 | $ 5,269,000 | $ 5,269,000 | $ 5,269,000 |  |
Jinmei |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Indirect investments | entity |  |  |  | 1 |  |  |

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