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Investments in Privately Held Companies (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) employee entity | Jun. 30, 2016 USD ($) entity | Jun. 30, 2017 USD ($) employee entity item | Jun. 30, 2016 USD ($) entity | Dec. 31, 2016 USD ($) entity | Mar. 31, 2017 USD ($)
Summary of investments [Abstract] |  |  |  |  |  |
Direct investments | item |  |  | 6 |  |  |
Indirect investments | item |  |  | 4 |  |  |
Investments in privately-held companies | $ 6,192,000 |  | $ 6,192,000 |  | $ 6,599,000 |
Net loss attributable to noncontrolling interests | (132,000) | $ (353,000) | (372,000) | $ (462,000) |  |
Equity investments classified as other assets | 12,004,000 |  | $ 12,004,000 |  | $ 12,842,000 |
Direct minority investments not consolidated | entity |  |  | 3 |  | 3 |
Minority investments not consolidated accounted for under equity method | entity |  |  | 7 |  |  |
Net income | (818,000) | (1,390,000) | $ (2,523,000) | (3,098,000) |  |
Impairment charge | $ 0 | $ 0 |  | $ 0 |  |
Joint Ventures [Member] |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Indirect investments | entity |  |  | 4 |  |  |
Number of consolidated joint ventures | entity | 3 | 3 | 3 | 3 |  |
Income (loss) from consolidated joint ventures | $ 208,000 | $ (306,000) | $ 196,000 | $ (481,000) |  |
Net loss attributable to noncontrolling interests | (132,000) | (353,000) | (372,000) | (462,000) |  |
Net income (loss) from joint ventures attributable to parent | 340,000 | 47,000 | 568,000 | (19,000) |  |
Other Assets [Member] |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Investments in privately-held companies | 10,300,000 |  | 10,300,000 |  | $ 11,300,000 |
Other Assets [Member] | Joint Ventures [Member] |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Minority investment in consolidated joint venture, included in other assets | 4,200,000 |  | 4,200,000 |  | 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 |
Percentage of ownership, consolidated method (in hundredths) |  |  | 46.00% |  |  |
Number of persons on board | employee | 1 |  | 1 |  |  |
Employee duration |  |  | 27 years |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Investments, consolidated | $ 592,000 |  | $ 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 |  | 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 | $ 1,394,000 |  | $ 1,394,000 |  | 1,498,000 |
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 | $ 3,813,000 |  | $ 3,813,000 |  | 4,000,000 |
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 | $ 985,000 |  | $ 985,000 |  | 1,101,000 |
Percentage of ownership, equity method (in hundredths) | 25.00% |  | 25.00% |  |  |
Seven Minority Investments |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Minority investments not consolidated accounted for under equity method | entity | 7 |  | 7 |  |  |
Net income | $ (188,000) | $ (400,000) | $ (1,100,000) | $ (856,000) |  |
One Gallium Company |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Investments in privately-held companies | 0 |  | 0 |  |  | $ 0
Impairment charge | 0 |  | $ 313,000 |  |  |
Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Indirect investments | entity |  |  | 3 |  |  |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Indirect investments | entity |  |  | 1 |  |  |
Majority-Owned Subsidiaries [Member] |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |
Investments, consolidated | $ 5,269,000 |  | $ 5,269,000 |  | $ 5,269,000 |

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