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Investments in Privately-held Raw Material Companies - Gain (loss) on sale and remeasurement of equity method investments (Details) - USD ($) |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
May 31, 2023 | Nov. 30, 2023 | May 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Fair value of the consideration received |  |  |  | $ 779,000 |
Gain (loss) recognized on sale |  |  |  | (166,000) |
Fair value of the retained investment in Emeishan Jia Mei High Purity Metals Co., Ltd. |  |  |  | $ 551,000 | $ 1,887,000
Percentage of equity interest sold |  |  |  | 15.00% |
Emeishan Jia Mei High Purity Metals Co., Ltd Investment |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Foreign income tax withholding |  |  |  | $ 48,000 |
Carrying value |  |  |  | (252,000) |
Gain (loss) recognized on sale |  |  | $ 575,000 | 575,000 |
Fair value of the retained investment in Emeishan Jia Mei High Purity Metals Co., Ltd. |  |  |  | 551,000 |
Carrying value of retained noncontrolling investment (10%) |  |  |  | (168,000) |
Gain on retained noncontrolling investment due to remeasurement (10%) |  |  |  | $ 383,000 |
Percentage of equity interest sold | 15.00% |  |  | 15.00% |
Percentage of ownership, cost method | 10.00% |  | 10.00% | 10.00% |
Percentage of ownership, equity method | 25.00% |  | 25.00% | 10.00% |
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Fair value of the consideration received |  | $ 600,000 |  | $ 585,000 |
Carrying value |  |  |  | (1,710,000) |
Gain (loss) recognized on sale |  |  |  | $ (1,125,000) |
Fair value of the retained investment in Emeishan Jia Mei High Purity Metals Co., Ltd. |  |  |  |  | $ 1,887,000
Percentage of equity interest sold |  | 46.00% |  | 46.00% |
Percentage of ownership, cost method |  | 0.00% |  | 0.00% |
Percentage of ownership, equity method |  | 46.00% |  |  |

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