Cash, Cash Equivalents and Investments - Investment Category and Length (Details)		1 Months Ended				12 Months Ended
	May 31, 2023 USD ($)	Dec. 31, 2023 USD ($)	Jun. 30, 2023 USD ($)	May 31, 2023 USD ($)	Jan. 31, 2023 USD ($)	Dec. 31, 2023 USD ($) company	Dec. 31, 2022 USD ($) company	Dec. 31, 2021 USD ($)	May 31, 2022 USD ($)	Apr. 30, 2022 USD ($)
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months							$ 2,118,000
Gross unrealized (loss), in loss position less than twelve months							(42,000)
Fair value, in loss position greater than twelve months		$ 2,140,000				$ 2,140,000	8,988,000
Gross unrealized (loss), in loss position greater than twelve months		(20,000)				(20,000)	(261,000)
Fair value, total in loss position		2,140,000				2,140,000	11,106,000
Gross unrealized (loss), total in loss position		(20,000)				(20,000)	(303,000)
Restricted Cash
Proceeds from short-term bank loans						56,470,000	53,078,000	$ 20,543,000
Restricted cash		12,362,000				12,362,000	6,400,000
Minority Investments
Investments, equity method		12,476,000				$ 12,476,000	$ 12,720,000
Number of equity method investments | company						3	6
Proceeds from sale of equity method investments						$ 827,000
Investment, cost method		551,000				551,000	$ 1,887,000
Loss on sale of equity investment						(166,000)
Bank Of Beijing
Restricted Cash
Maximum borrowing capacity									$ 3,400,000
Bank Of Beijing | Secured debt
Restricted Cash
Time deposit							2,500,000		$ 1,000,000.0	$ 2,900,000
Proceeds from short-term bank loans					$ 2,300,000
June 2023 bank loan two | Secured debt
Restricted Cash
Time deposit		3,900,000				3,900,000
Proceeds from short-term bank loans						3,500,000
June 2023 bank loan one | Secured debt
Restricted Cash
Time deposit		1,500,000	$ 1,500,000			$ 1,500,000
Proceeds from short-term bank loans		$ 1,400,000	$ 1,400,000
Bank Of China | Secured debt
Restricted Cash
Time deposit					3,000,000.0
Proceeds from short-term bank loans					$ 2,900,000
Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Minority Investments
Investments, equity method							418,000
Ownership (as a percent)	25.00%	10.00%		25.00%		10.00%
Proceeds from sale of equity method investments	$ 10			$ 827,000
Investment, cost method		$ 551,000				$ 551,000
Equity ownership percentage	10.00%	10.00%		10.00%		10.00%
Loss on sale of equity investment				$ 575,000		$ 575,000
Beijing JiYa Semiconductor Material Co., Ltd Investment
Minority Investments
Investments, equity method		$ 3,806,000				$ 3,806,000	6,381,000
Ownership (as a percent)		39.00%				39.00%
Certificates of deposit.
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position less than twelve months							2,118,000
Gross unrealized (loss), in loss position less than twelve months							(42,000)
Fair value, in loss position greater than twelve months		$ 2,140,000				$ 2,140,000	4,146,000
Gross unrealized (loss), in loss position greater than twelve months		(20,000)				(20,000)	(133,000)
Fair value, total in loss position		2,140,000				2,140,000	6,264,000
Gross unrealized (loss), total in loss position		(20,000)				(20,000)	(175,000)
Corporate bonds
Summary of fair value and gross unrealized losses related to available-for-sale securities [Abstract]
Fair value, in loss position greater than twelve months							4,842,000
Gross unrealized (loss), in loss position greater than twelve months							(128,000)
Fair value, total in loss position							4,842,000
Gross unrealized (loss), total in loss position							(128,000)
Other assets
Minority Investments
Investments, equity method		$ 12,500,000				$ 12,500,000	$ 14,600,000