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Investments in Privately-Held Companies (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
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Jun. 15, 2018 USD ($) installment | Nov. 02, 2017 USD ($) | Sep. 30, 2018 USD ($) employee subsidiary entity | Sep. 30, 2018 USD ($) employee subsidiary entity | Sep. 30, 2017 USD ($) subsidiary entity company | Sep. 30, 2018 USD ($) employee subsidiary entity item | Sep. 30, 2017 USD ($) subsidiary entity company | Dec. 31, 2017 USD ($) entity | Aug. 31, 2018 | Jun. 14, 2018 | Nov. 01, 2017 | Mar. 31, 2017 USD ($)
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Direct investments | item |  |  |  |  |  | 6 |  |  |  |  |  |
Indirect investments | item |  |  |  |  |  | 4 |  |  |  |  |  |
Investments, equity method |  |  | $ 5,131,000 | $ 5,131,000 |  | $ 5,131,000 |  | $ 5,578,000 |  |  |  |
Payment of first installment |  |  |  |  |  | 415,000 |  |  |  |  |  |
Remainder portion of payment |  |  | $ 1,192,000 | $ 1,192,000 |  | $ 1,192,000 |  |  |  |  |  |
Number of consolidated joint ventures | subsidiary |  |  | 1 | 1 | 1 | 1 | 1 |  |  |  |  |
Net income (loss) attributable to noncontrolling interests |  |  |  | $ 208,000 | $ 146,000 | $ 1,173,000 | $ (226,000) |  |  |  |  |
Direct minority investments not consolidated | entity |  |  |  |  |  | 3 |  | 3 |  |  |  |
Impairment charge |  |  |  | $ 0 | $ 0 | $ 0 |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Indirect investments | entity |  |  |  |  |  | 4 |  |  |  |  |  |
Number of consolidated joint ventures | entity |  |  | 3 | 3 | 3 | 3 | 3 |  |  |  |  |
Income (loss) from consolidated joint ventures |  |  |  | $ 1,300,000 | $ 860,000 | $ 4,800,000 | $ 1,100,000 |  |  |  |  |
Net income (loss) attributable to noncontrolling interests |  |  |  | 208,000 | 146,000 | 1,200,000 | (200,000) |  |  |  |  |
Net income (loss) from joint ventures attributable to parent |  |  |  | 1,100,000 | $ 714,000 | 3,700,000 | 1,300,000 |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  | $ 9,500,000 | 9,500,000 |  | 9,500,000 |  | $ 9,800,000 |  |  |  |
Other assets | Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Minority investment in consolidated joint venture, included in other assets |  |  | 4,400,000 | 4,400,000 |  | 4,400,000 |  | 4,300,000 |  |  |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  | $ 1,450,000 | $ 1,450,000 |  | $ 1,450,000 |  | 1,473,000 |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  | 46.00% | 46.00% |  | 46.00% |  |  |  |  |  |
Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  | $ 2,811,000 | $ 2,811,000 |  | $ 2,811,000 |  | 3,190,000 |  |  |  |
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, equity method |  |  | $ 870,000 | $ 870,000 |  | $ 870,000 |  | 915,000 |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  | 25.00% | 25.00% |  | 25.00% |  |  |  |  |  |
One Gallium Company |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  |  |  |  | $ 0
Impairment charge |  |  |  |  |  |  | $ 313,000 |  |  |  |  |
Number of gallium companies with impairment charge | company |  |  |  |  | 1 |  | 1 |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Indirect investments | entity |  |  |  |  |  | 3 |  |  |  |  |  |
Number of persons on board | employee |  |  | 1 | 1 |  | 1 |  |  |  |  |  |
Employee duration |  |  |  |  |  | 27 years |  |  |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of persons on board | employee |  |  | 2 | 2 |  | 2 |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Number of new board representatives | employee |  |  |  |  |  | 2 |  |  |  |  |  |
Jinmei |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Indirect investments | entity |  |  |  |  |  | 1 |  |  |  |  |  |
Majority-Owned Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  | $ 5,269,000 | $ 5,269,000 |  | $ 5,269,000 |  | 5,269,000 |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  | $ 3,331,000 | $ 3,331,000 |  | $ 3,331,000 |  | 3,331,000 |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment | Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 46.00% | 46.00% |  | 46.00% |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  | $ 592,000 | $ 592,000 |  | $ 592,000 |  | 592,000 |  |  |  |
Additional percentage of ownership, consolidated method | 12 |  | 2 | 2 |  | 2 |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest | $ 1,400,000 |  | $ 252,000 |  |  |  |  |  |  |  |  |
Number of installments | installment | 2 |  |  |  |  |  |  |  |  |  |  |
Payment of first installment | $ 163,000 |  |  |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Accrued Liabilities [Member] |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Remainder portion of payment |  |  | $ 1,200,000 | $ 1,200,000 |  | $ 1,200,000 |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 97.00% | 97.00% |  | 97.00% |  |  | 95.00% | 83.00% |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  | $ 1,346,000 | $ 1,346,000 |  | $ 1,346,000 |  | $ 1,346,000 |  |  |  |
Gain (loss) from equity transaction |  | $ 0 |  |  |  |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | 3rd party investor |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage ownership from issuance of shares |  | 10.00% |  |  |  |  |  |  |  |  |  |
Raised additional capital |  | $ 2,000,000 |  |  |  |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 63.00% | 63.00% |  | 63.00% |  |  |  |  | 70.00% |

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