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Investments in Privately Held Companies (Details) |  | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 02, 2017 USD ($) | Mar. 31, 2018 USD ($) employee subsidiary entity item | Mar. 31, 2017 USD ($) subsidiary | Dec. 31, 2017 USD ($) entity | Mar. 31, 2017 entity | Mar. 31, 2017 company | Mar. 31, 2017 USD ($)
Summary of investments [Abstract] |  |  |  |  |  |  |
Direct investments | item |  | 6 |  |  |  |  |
Indirect investments | item |  | 4 |  |  |  |  |
Investments in privately-held companies |  | $ 5,453,000 |  | $ 5,578,000 |  |  |
Number of consolidated joint ventures | subsidiary |  | 1 | 1 |  |  |  |
Net loss attributable to noncontrolling interests |  | $ 315,000 | $ (240,000) |  |  |  |
Net income |  | $ (334,000) | (933,000) |  |  |  |
Direct minority investments not consolidated | entity |  | 3 |  | 3 |  |  |
Impairment charge |  | $ 0 |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Indirect investments | entity |  | 4 |  |  |  |  |
Number of consolidated joint ventures | entity |  | 3 |  |  |  |  |
Income (loss) from consolidated joint ventures |  | $ 1,400,000 | (12,000) |  |  |  |
Net loss attributable to noncontrolling interests |  | 315,000 | (240,000) |  |  |  |
Net income (loss) from joint ventures attributable to parent |  | 1,100,000 | 228,000 |  |  |  |
Other assets |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | 9,700,000 |  | $ 9,800,000 |  |  |
Other assets | Joint Ventures |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Minority investment in consolidated joint venture, included in other assets |  | 4,300,000 |  | 4,300,000 |  |  |
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% |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |
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 Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments, consolidated |  | $ 1,346,000 |  | 1,346,000 |  |  |
Percentage of ownership, consolidated method (in hundredths) | 70.00% | 63.00% |  |  |  |  |
Investment gain | $ 0 |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | 3rd party investor |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments, consolidated | $ 2,000,000 |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) | 10.00% |  |  |  |  |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | $ 1,525,000 |  | 1,473,000 |  |  |
Percentage of ownership, equity method (in hundredths) |  | 46.00% |  |  |  |  |
Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | $ 3,017,000 |  | 3,190,000 |  |  |
Percentage of ownership, equity method (in hundredths) |  | 25.00% |  |  |  |  |
Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  | $ 911,000 |  | 915,000 |  |  |
Percentage of ownership, equity method (in hundredths) |  | 25.00% |  |  |  |  |
One Gallium Company |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Investments in privately-held companies |  |  |  |  |  |  | $ 0
Impairment charge |  |  | $ 313,000 |  |  |  |
Number of gallium companies with impairment charge |  |  |  |  | 1 | 1 |
Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Indirect investments | entity |  | 3 |  |  |  |  |
Number of persons on board | employee |  | 1 |  |  |  |  |
Employee duration |  | 27 years |  |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Number of persons on board | employee |  | 2 |  |  |  |  |
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 |  |  |
Jinmei |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |
Indirect investments | entity |  | 1 |  |  |  |  |

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