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Investments in Privately-Held Raw Material Companies (Details)			1 Months Ended						12 Months Ended
	Jan. 25, 2021 USD ($)	Nov. 02, 2017 USD ($)	Aug. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	Dec. 31, 2022 USD ($) employee	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Sep. 30, 2022	Apr. 30, 2022 USD ($)	Nov. 30, 2020	Jul. 31, 2020
Summary of investments
Investments, equity method									$ 14,607,000	$ 10,166,000
Aggregate dividends paid											$ 2,238,000
Increase in redeemable noncontrolling interests										1,514,000
Impairment charge									0	0	0
Dividend received									1,608,000	774,000
Other assets
Summary of investments
Investments, equity method									14,600,000	10,200,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments
Investments, equity method									$ 1,887,000	2,053,000
Percentage of ownership, equity method									46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method									$ 6,381,000	3,760,000
Percentage of ownership, equity method									39.00%
Dividends received			$ 100,000
PRC subsidiaries and PRC raw material joint ventures
Summary of investments
Dividends received									$ 2,900,000	774,000	$ 0
Aggregate dividends paid									$ 0	0
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Dividends received					$ 1,300,000
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Percentage of ownership, equity method									25.00%
Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, equity method									$ 5,094,000	4,095,000
Percentage of ownership, equity method									25.00%
Dividends received				$ 1,500,000		$ 774,000
ChaoYang KaiMei Quartz Co., Ltd
Summary of investments
Investments, equity method									$ 827,000				$ 3,000,000.0
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	258,000
Percentage of ownership, equity method									25.00%
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 \| Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Percentage of ownership, equity method									25.00%
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 ownership, consolidated method (in hundredths)											67.00%			63.00%
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
Summary of investments
Number of new board representatives \| employee									2
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
Summary of investments
Number of new board representatives \| employee									2
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									$ 12,089,000	5,572,000
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)								91.50%	85.50%						100.00%
Percentage of ownership interest sold								8.50%
Proceeds from sale of previously consolidated subsidiary shares								$ 396,000
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Investments, consolidated method									$ 1,346,000	1,346,000
Additional percentage of ownership, consolidated method											4
Purchase of subsidiary shares from noncontrolling interest											$ 1,600,000
Gain (loss) from equity transaction		$ 0
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									$ 1,000,000
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	$ 1,814,000
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%