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Investments in Privately-Held Raw Material Companies - Gain on Deconsolidation (Details) - USD ($) | 3 Months Ended |
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Mar. 31, 2020 | Mar. 31, 2019 | Mar. 12, 2019
Investments in Privately-Held Raw Material Companies |  |  |
Fair value of the consideration received | $ 366,000 | $ 366,000 |
Fair value of the retained investment in Beijing JiYa Semiconductor Material Co., Ltd. |  | 2,040,000 | $ 2,040,000
Carrying value of non-controlling interest, net of accumulated other comprehensive income attributable to subsidiary |  | 617,000 |
Derecognition of Beijing JiYa Semiconductor Material Co., Ltd.'s net asset |  | (2,848,000) |
Gain recognized on deconsolidation of Beijing JiYa Semiconductor Material Co., Ltd. |  | 175,000 |
Carrying value of retained noncontrolling investment |  | (1,559,000) |
Gain on retained noncontrolling investment due to remeasurement |  | $ 481,000 |

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