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Investments in Privately-Held Companies (Details) |  |  | 1 Months Ended | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jun. 15, 2018 USD ($) installment | Nov. 02, 2017 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2018 USD ($) employee entity | Jun. 30, 2019 USD ($) employee subsidiary | Mar. 31, 2019 USD ($) | Jun. 30, 2018 USD ($) subsidiary | Jun. 30, 2019 USD ($) employee entity subsidiary | Jun. 30, 2018 USD ($) subsidiary | Dec. 31, 2018 USD ($) | Jun. 01, 2019 USD ($) | Apr. 30, 2019 | Mar. 11, 2019 | Mar. 10, 2019 | Aug. 31, 2018 | Jun. 14, 2018 | Nov. 01, 2017
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  | $ 6,449,000 |  |  | $ 6,449,000 |  | $ 3,958,000 |  |  |  |  |  |  |
Proceeds from sale of previously consolidated subsidiary shares |  |  |  |  |  |  |  | 366,000 |  |  |  |  |  |  |  |  |
Gain on deconsolidation |  |  |  |  |  |  |  | 175,000 |  |  |  |  |  |  |  |  |
Additional percentage of ownership, consolidated method |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of first installment |  |  |  |  |  |  |  | 262,000 | $ 163,000 |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  | 4,347,000 |  |  | 4,347,000 |  | 3,697,000 |  |  |  |  |  |  |
Remainder portion of payment |  |  |  |  | $ 151,000 |  |  | $ 151,000 |  | 1,147,000 |  |  |  |  |  |  |
Number of persons on board | employee |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consolidated joint ventures | subsidiary |  |  |  |  | 1 |  | 1 | 1 | 1 |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  | $ 287,000 |  | $ 650,000 | $ 368,000 | $ 965,000 |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  | 0 | $ 1,100,000 |  | $ 1,100,000 |  | 0 |  |  |  |  |  |  |
Impaired entities | entity |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consolidated joint ventures | entity |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Income from consolidated joint ventures |  |  |  |  | 800,000 |  | 2,100,000 | $ 1,500,000 | 3,500,000 |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  | 300,000 |  | 700,000 | 400,000 | 1,000,000 |  |  |  |  |  |  |  |
Net income from joint ventures attributable to parent |  |  |  |  | 500,000 |  | $ 1,500,000 | 1,100,000 | $ 2,500,000 |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  | $ 6,400,000 |  |  | $ 6,400,000 |  | 8,400,000 |  |  |  |  |  |  |
Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |
Direct minority investments not consolidated | entity |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment | Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  | $ 1,385,000 |  |  | $ 1,385,000 |  | 1,416,000 |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  | 46.00% |  |  | 46.00% |  |  |  |  |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment | Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  | $ 1,966,000 |  |  | $ 1,966,000 |  |  |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  | 39.00% |  |  | 39.00% |  |  |  |  |  |  |  |  |
Xilingol Tongli Germanium Co. Ltd Investment | Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  | $ 0 |  |  | $ 0 |  | 1,700,000 |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |
Xiaoyi XingAn Gallium Co., Ltd. | Xiaoyi XingAn Gallium Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  | $ 2,353,000 |  |  | $ 2,353,000 |  |  |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |
Emeishan Jia Mei High Purity Metals Co., Ltd Investment | Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  | $ 745,000 |  |  | $ 745,000 |  | 842,000 |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% | 46.00% |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 100.00% |  |  |  |  |  |  |  |  | 97.00% |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new board representatives | employee |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of persons on board | employee |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |
Majority-Owned Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  | $ 1,938,000 |  |  | $ 1,938,000 |  | 5,269,000 |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  | $ 592,000 |  |  | $ 592,000 |  | 592,000 |  |  |  |  |  |  |
Additional percentage of ownership, consolidated method | 12 |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest | $ 1,400,000 |  | $ 413,000 | $ 252,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Number of installments | installment | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of first installment | $ 163,000 |  | 262,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of second installment |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Remainder portion of payment |  |  | $ 151,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  |  | 95.00% | 83.00% |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  |  | 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% |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  | 70.00%

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