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Investments in Privately-Held Raw Material Companies (Details) |  |  |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Jan. 25, 2021 USD ($) | Jun. 15, 2018 USD ($) installment | Nov. 02, 2017 USD ($) employee | Jun. 30, 2021 USD ($) | Jan. 31, 2021 USD ($) | Aug. 31, 2020 USD ($) | May 31, 2019 USD ($) | Sep. 30, 2018 USD ($) employee entity | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Mar. 31, 2019 USD ($) | Sep. 30, 2021 USD ($) employee entity | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jul. 31, 2020 | Dec. 31, 2019 | Jun. 01, 2019 USD ($) | Apr. 30, 2019 | Aug. 31, 2018 | Jun. 14, 2018 | Nov. 01, 2017
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  | $ 9,340,000 |  |  | $ 9,340,000 |  | $ 6,376,000 |  |  |  |  |  |  |
Increase in redeemable noncontrolling interests due to issuance of Tongmei's common stock |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  | 1,514,000 |  |  |  |  |  |  |  |  |
Investments, government approved | $ 49,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  | 17,814,000 |  |  | 17,814,000 |  | 15,350,000 |  |  |  |  |  |  |
Remainder portion of payment |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,439,000 |  |  |  |  |  |  |
Number of persons on board | employee |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |  |  |  |  |
Impairment charge |  |  |  |  |  |  |  |  | 0 | $ 0 | $ 1,100,000 | 0 | $ 0 |  |  |  |  |  |  |  |
Dividend received |  |  |  |  |  |  |  |  |  |  |  | 774,000 |  |  |  |  |  |  |  |  |
Joint Ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of consolidated joint ventures | entity |  |  |  |  |  |  |  | 3 |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  | 9,300,000 |  |  | $ 9,300,000 |  | 6,400,000 |  |  |  |  |  |  |
Xilingol Tongli Germanium Co. Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Direct minority investments not consolidated | entity |  |  |  |  |  |  |  |  |  |  |  | 1 |  |  |  |  |  |  |  |  |
Xiaoyi XingAn Gallium Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividend received |  |  |  | $ 774,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 1,961,000 |  |  | $ 1,961,000 |  | 1,651,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 3,333,000 |  |  | $ 3,333,000 |  | 1,418,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 3,727,000 |  |  | $ 3,727,000 |  | 2,822,000 |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  | $ 319,000 |  |  | $ 319,000 |  | $ 485,000 |  |  |  |  |  |  |
Percentage of ownership, equity method (in hundredths) |  |  |  |  |  |  |  |  | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  | 100.00% |  |  |  |  |  |  |  |  |  |  | 97.00% |  |  |
Percentage of outstanding shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  |  | 67.00% |  | 63.00% |  |  |  |  |
Percentage of outstanding shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |  |  |  |
Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  | 85.50% |  |  | 85.50% |  |  |  |  |  |  |  |  |
Percentage of outstanding shares | 7.28% |  |  |  |  |  |  |  | 14.50% |  |  | 14.50% |  |  |  |  |  |  |  |  |
Private equity ownership percentage | 7.28% |  |  |  |  |  |  |  |  |  |  | 14.50% |  |  |  |  |  |  |  |  |
Percentage of key managers and contributors purchased |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.40% |  |  |  |  |  |  |
Increase in redeemable noncontrolling interests due to issuance of Tongmei's common stock |  |  |  |  | $ 1,500,000 |  |  |  |  |  |  |  |  | $ 48,100,000 |  |  |  |  |  |  |
Investments, government approved | $ 49,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new board representatives | employee |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.38% |  |  |  |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of new board representatives | employee |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.59% |  |  |  |  |  |  |
Majority-Owned Subsidiaries |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  | $ 5,572,000 |  |  | $ 5,572,000 |  | $ 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 | 2 |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment of second installment |  |  |  |  |  |  | $ 1,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  | 95.00% |  |  |  |  |  | 97.00% | 85.50% |  |  | 85.50% |  |  |  |  |  |  | 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 |  |  |  |  |  |  |
ChaoYang JinMei Gallium Co., Ltd[member] | ChaoYang JinMei Gallium Co., Ltd[member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  | 91.50% |  |  | 85.50% |  |  | 85.50% |  |  | 100.00% |  |  |  |  |  |
Percentage of ownership interest sold |  |  |  |  |  | 8.50% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from sale of previously consolidated subsidiary shares |  |  |  |  |  | $ 396,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  | $ 1,346,000 |  |  | $ 1,346,000 |  | $ 1,346,000 |  |  |  |  |  |  |
Additional percentage of ownership, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |
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% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Additional percentage of ownership, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  |  | 4 |  |  |  |  |  |  |
Purchase of subsidiary shares from noncontrolling interest |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,600,000 |  |  |  |  |  |  |
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% |  |  |  |  |  | 85.50% |  |  | 85.50% |  |  |  |  |  |  |  |  | 70.00%
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  | $ 1,814,000 |  |  | $ 1,814,000 |  |  |  |  |  |  |  |  |
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd | ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  | 58.50% |  |  | 58.50% |  |  |  |  |  |  |  |  |

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