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Investments in Privately-held Raw Material Companies (Details) - USD ($) |  |  | 1 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
May 31, 2023 | Jan. 25, 2021 | Nov. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Jan. 31, 2023 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022 | Apr. 30, 2022 | Jun. 30, 2021 | Jan. 31, 2021 | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Sep. 30, 2023 | Aug. 31, 2023 | Jul. 31, 2023 | Sep. 30, 2022
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,476,000 | $ 12,720,000 |  |  |  |  |  |
Investment, cost method |  |  |  |  |  |  |  |  |  |  |  |  | 551,000 | 1,887,000 |  |  |  |  |  |
Dividend received |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,316,000 | 1,608,000 | $ 774,000 |  |  |  |  |
Percentage of equity interest sold |  |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Proceeds from sale of equity method investments |  |  |  |  |  |  |  |  |  |  |  |  | $ 827,000 |  |  |  |  |  |  |
Loss on sale of equity investment |  |  |  |  |  |  |  |  |  |  |  |  | (166,000) |  |  |  |  |  |  |
Fair value of the consideration received |  |  |  |  |  |  |  |  |  |  |  |  | 779,000 |  |  |  |  |  |  |
3rd Party Investor |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of equity interest sold |  |  | 46.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  |  |  |  |  | $ 12,500,000 | 14,600,000 |  |  |  |  |  |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment, cost method |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,887,000 |  |  |  |  |  |
Percentage of ownership, equity method |  |  | 46.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, cost method |  |  | 0.00% |  |  |  |  |  |  |  |  |  | 0.00% |  |  |  |  |  |  |
Percentage of equity interest sold |  |  | 46.00% |  |  |  |  |  |  |  |  |  | 46.00% |  |  |  |  |  |  |
Loss on sale of equity investment |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,125,000) |  |  |  |  |  |  |
Fair value of the consideration received |  |  | $ 600,000 |  |  |  |  |  |  |  |  |  | 585,000 |  |  |  |  |  |  |
Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,806,000 | 6,381,000 |  |  |  |  |  |
Percentage of ownership, equity method |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% |  |  |  |  |  |  |
Dividends received |  |  | $ 500,000 |  | $ 2,000,000.0 |  | $ 100,000 |  |  |  |  |  |  |  |  |  |  |  |  |
PRC subsidiaries and PRC raw material joint ventures |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,300,000 | 2,900,000 | $ 774,000 |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  |  | $ 1,300,000 |  |  |  |  |  |  |  |  |  |  |
Xiaoyi XingAn Gallium Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  |  |  |  |  | $ 5,516,000 | 5,094,000 |  |  |  |  |  |
Percentage of ownership, equity method |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Dividends received |  |  |  |  |  |  |  | $ 1,500,000 |  | $ 1,800,000 | $ 774,000 |  |  |  |  |  |  |  |  |
ChaoYang KaiMei Quartz Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  | $ 900,000 |  |  |  | $ 3,000,000.0 |  |  | $ 3,154,000 | 827,000 |  |  | $ 2,300,000 | $ 600,000 | $ 600,000 |
Percentage of ownership, equity method |  |  |  |  |  |  |  |  |  | 40.00% |  |  | 40.00% |  |  |  |  |  |  |
Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, equity method |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 418,000 |  |  |  |  |  |
Investment, cost method |  |  |  |  |  |  |  |  |  |  |  |  | $ 551,000 |  |  |  |  |  |  |
Percentage of ownership, equity method | 25.00% |  |  | 25.00% |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Percentage of ownership, cost method | 10.00% |  |  | 10.00% |  |  |  |  |  |  |  |  | 10.00% |  |  |  |  |  |  |
Percentage of equity interest sold | 15.00% |  |  |  |  |  |  |  |  |  |  |  | 15.00% |  |  |  |  |  |  |
Proceeds from sale of equity method investments | $ 10 |  |  | $ 827,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss on sale of equity investment |  |  |  | 575,000 |  |  |  |  |  |  |  |  | $ 575,000 |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 8.50% |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Beijing JiYa Semiconductor Material Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, equity method |  |  |  |  |  |  |  |  |  |  |  |  | 39.00% |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, equity method |  |  |  |  |  |  |  |  |  |  |  |  | 25.00% |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of outstanding shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 33.00% |  |  |  |
Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  | 85.50% |  |  |  |  |  |  |  |  |
Percentage of outstanding shares |  | 7.28% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14.50%
Private equity ownership percentage |  | 7.28% |  |  |  |  |  |  |  |  |  |  |  | 14.50% |  |  |  |  |  |
Percentage of key managers and contributors purchased |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.40% |  |  |  |
Increase in redeemable noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  | $ 1,500,000 |  |  |  | $ 48,100,000 |  |  |  |
Investments, government approved |  | $ 49,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.38% |  |  |  |
Nanjing JinMei Gallium Co., Ltd | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.0038% |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd | Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.59% |  |  |  |
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd | Beijing Tongmei Xtal Technology |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Private equity ownership percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.59% |  |  |  |
Majority-Owned Subsidiaries [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  | $ 14,211,000 | $ 12,089,000 |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  | $ 592,000 | 592,000 |  |  |  |  |  |
Nanjing JinMei Gallium Co., Ltd Investment | Nanjing JinMei Gallium Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 85.50% |  |  |  |  |  |  |
ChaoYang Jin Mei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,820,000 | 1,820,000 |  |  |  |  |  |
ChaoYang Jin Mei Gallium Co., Ltd | ChaoYang Jin Mei Gallium Co., Ltd |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 85.50% |  |  |  |  |  |  |
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,346,000 | 1,346,000 |  |  |  |  |  |
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) |  |  |  |  |  |  |  |  |  |  |  |  | 85.50% |  |  |  |  |  |  |
ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,122,000 | 1,000,000 |  |  |  |  |  |
Increase in redeemable noncontrolling interests |  |  |  | $ 75,000 |  | $ 36,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd. | ChaoYang ShuoMei High Purity Semiconductor Materials Co., Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 75.00% |  |  |  |  |  |  |
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments, consolidated method |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,331,000 | $ 7,331,000 |  |  |  |  |  |
Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. | Chao Yang XinMei High Purity Semiconductor Materials Co. Ltd. |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Summary of investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of ownership, consolidated method (in hundredths) |  |  |  |  |  |  |  |  |  |  |  |  | 58.50% |  |  |  |  |  |  |

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- Definition This item represents the carrying amount on the entity's balance sheet of its investment in common stock of an equity method investee. This is not an indicator of the fair value of the investment, rather it is the initial cost adjusted for the entity's share of earnings and losses of the investee, adjusted for any distributions (dividends) and other than temporary impairment (OTTI) losses recognized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481664/323-10-45-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 323 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a)(3) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481687/323-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(10)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 280 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 25 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482810/280-10-50-25 + Details
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