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Investments in Privately-Held Raw Material Companies (Details) |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended |  |  |  |  |  |  |  |
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Jun. 15, 2018 USD ($) installment | Nov. 02, 2017 USD ($) | Aug. 31, 2020 USD ($) | Jul. 31, 2020 USD ($) | Apr. 30, 2020 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2018 USD ($) employee entity | Sep. 30, 2020 USD ($) employee | Sep. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2020 USD ($) entity employee | Sep. 30, 2019 USD ($) | Dec. 31, 2019 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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  | $ 5,826,000 |  |  | $ 5,826,000 |  | $ 5,961,000 |  |  |  |  |  |  |
Proceeds from sale of previously consolidated subsidiary shares |  |  |  |  |  |  |  |  |  | $ 366,000 | 366,000 |  |  |  |  |  |  |  |  |
Gain on deconsolidation |  |  |  |  |  |  |  |  |  | 175,000 |  | $ 175,000 |  |  |  |  |  |  |  |
Additional percentage of ownership, consolidated method |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of first installment |  |  |  |  |  |  |  |  |  |  |  | 262,000 |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  | 6,498,000 |  |  | 6,498,000 |  | 4,877,000 |  |  |  |  |  |  |
Remainder portion of payment |  |  |  |  |  |  |  | 49,000 |  |  | 49,000 |  | 151,000 |  |  |  |  |  |  |
Number of persons on board | employee |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  | 490,000 | $ 403,000 |  | 1,483,000 | 771,000 |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  | 0 | 0 | $ 1,100,000 | $ 0 | 1,100,000 |  |  |  |  |  |  |  |
Impaired entities | entity |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consolidated joint ventures | entity |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Income from consolidated joint ventures |  |  |  |  |  |  |  | 1,800,000 | 1,100,000 |  | $ 4,300,000 | 2,600,000 |  |  |  |  |  |  |  |
Net income attributable to noncontrolling interests |  |  |  |  |  |  |  | 500,000 | 400,000 |  | 1,500,000 | 800,000 |  |  |  |  |  |  |  |
Net income (loss) from joint ventures attributable to parent |  |  |  |  |  |  |  | 1,300,000 | $ 700,000 |  | 2,800,000 | $ 1,800,000 |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  | 5,800,000 |  |  | $ 5,800,000 |  | 6,000,000.0 |  |  |  |  |  |  |
Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  | $ 1,509,000 |  |  | $ 1,509,000 |  | 1,326,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  | $ 1,192,000 |  |  | $ 1,192,000 |  | 1,621,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  | $ 0 |  |  | $ 0 |  |  |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |
Xiaoyi XingAn Gallium Co., Ltd. | Xiaoyi XingAn Gallium Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  | $ 2,605,000 |  |  | $ 2,605,000 |  | 2,367,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  | $ 520,000 |  |  | $ 520,000 |  | 647,000 |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% | 46.00% |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment | Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% | 46.00% |  |  |
Chaoyang JinMei Gallium Co., Ltd[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 91.50% | 100.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  | 97.00% |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new board representatives | employee |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of persons on board | employee |  |  |  |  |  |  |  | 2 |  |  | 2 |  |  |  |  |  |  |  |  |
Majority-Owned Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  | $ 3,758,000 |  |  | $ 3,758,000 |  | 3,758,000 |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  | $ 29,000 | $ 73,000 | 262,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of second installment |  |  |  |  |  | 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |  |  |
Remainder portion of payment |  |  |  |  |  | $ 49,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  | 100.00% |  |  | 100.00% |  |  |  |  |  |  | 95.00% | 83.00% |
Chaoyang JinMei Gallium Co., Ltd[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  | $ 1,820,000 |  |  | $ 1,820,000 |  | 1,820,000 |  |  |  |  |  |  |
Percentage Of Ownership Interest Sold |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of previously consolidated subsidiary shares |  |  | $ 396,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional percentage of ownership, consolidated method |  |  | 8.5 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  | $ 396,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Chaoyang JinMei Gallium Co., Ltd[member] | Chaoyang JinMei Gallium Co., Ltd[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  | 91.50% | 100.00% |  |  |  | 91.50% |  |  | 91.50% |  |  |  |  |  |  |  |  |
Percentage Of Ownership Interest Sold |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of previously consolidated subsidiary shares |  |  | $ 396,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment | Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  | 46.00% |  |  | 46.00% |  |  |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  | 63.00% |  |  | 63.00% |  |  |  |  |  |  |  |  | 70.00%

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