Amount of gain (loss) on adjustment to fair value of an equity method investment.

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The carrying value of equity method investments net of write off.

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Represents the number of minority investment entities that are not consolidated and are accounted for under the equity method.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of other-than-temporary decline in value that has been recognized against investment accounted for under equity method of accounting.

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The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

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Amount of gain (loss) on sale or disposal of an equity method investment.

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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.

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Percentage of ownership of equity interest excluding interest in entity that is consolidated and equity method investee.

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Includes other investments and securities that are not at fair value as of the balance sheet date and those that are not accounted for under the equity method.

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The cash inflow associated with the sale of equity method investments, which are investments in joint ventures and entities in which the entity has an equity ownership interest normally of 20 to 50 percent and exercises significant influence.

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Amount of cash restricted as to withdrawal or usage, classified as current. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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Investments and Fair Value Measurements - Investment Category and Length (Details)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	May 31, 2023 USD ($)	Jun. 30, 2024 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2024 USD ($) company	Jun. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) company
Available-for-Sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Fair value, in loss position greater than twelve months		$ 1,675,000		$ 1,675,000		$ 2,140,000
Gross unrealized (loss), in loss position greater than twelve months		(5,000)		(5,000)		(20,000)
Fair value, total in loss position		1,675,000		1,675,000		2,140,000
Gross unrealized (loss), total in loss position		(5,000)		(5,000)		(20,000)
Restricted Cash
Restricted cash		13,789,000		13,789,000		12,362,000
Investments in Privately-Held Raw Material Companies
Investments, equity method		11,949,000		$ 11,949,000		$ 12,476,000
Number of equity method investments \| company				3		3
Proceeds from sale of equity method investments					$ 827,000
Investments, cost method		$ 551,000		$ 551,000		$ 551,000
Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Investments in Privately-Held Raw Material Companies
Ownership (as a percent)	25.00%	10.00%		10.00%
Equity ownership percentage	10.00%	10.00%		10.00%
Proceeds from sale of equity method investments	$ 827,000
Investments, cost method		$ 551,000		$ 551,000		551,000
Loss on sale of equity investment	$ 575,000		$ 958,000	575,000
Realized gain on adjustment of fair value of investment				383,000
Beijing JiYa Semiconductor Material Co., Ltd Investment
Investments in Privately-Held Raw Material Companies
Investments, equity method		4,400,000		4,400,000		3,806,000
Equity investment carrying value of asset after write down		$ 0		$ 0
Impairment charge on equity investee			754,000
Ownership (as a percent)		39.00%		39.00%
Investments Excluding Beijing JiYa Semiconductor Material Co., Ltd.
Investments in Privately-Held Raw Material Companies
Impairment charge on equity investee		$ 0	$ 0	$ 0	$ 0
Certificates of Deposit [Member]
Available-for-Sale Securities, Continuous Unrealized Loss Position, Qualitative Disclosure [Abstract]
Fair value, in loss position greater than twelve months		1,675,000		1,675,000		2,140,000
Gross unrealized (loss), in loss position greater than twelve months		(5,000)		(5,000)		(20,000)
Fair value, total in loss position		1,675,000		1,675,000		2,140,000
Gross unrealized (loss), total in loss position		(5,000)		(5,000)		(20,000)
Other Assets [Member]
Investments in Privately-Held Raw Material Companies
Investments, equity method		11,900,000		11,900,000		$ 12,500,000
Other noncurrent assets \| Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Investments in Privately-Held Raw Material Companies
Investments, cost method		$ 551,000		$ 551,000