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Period Type:

Investments in Privately-Held Raw Material Companies (Details)				1 Months Ended				3 Months Ended	12 Months Ended
	Jan. 25, 2021 USD ($)	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($)	Jan. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($) employee entity	Mar. 31, 2019 USD ($)	Dec. 31, 2021 USD ($) entity employee	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($) subsidiary	Nov. 30, 2020	Jul. 31, 2020	Jun. 01, 2019 USD ($)	Apr. 30, 2019	Mar. 11, 2019	Mar. 10, 2019	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017
Summary of investments
Investments, equity method									$ 10,166,000	$ 6,376,000
Increase in redeemable noncontrolling interests due to issuance of Tongmei's common stock									1,514,000	48,102,000
Proceeds from sale of previously consolidated subsidiary shares											$ 366,000
Gain on deconsolidation											175,000
Payment of first installment											$ 262,000
Noncontrolling interests									18,317,000	15,350,000
Remainder portion of payment										1,439,000
Number of consolidated joint ventures \| subsidiary											1
Impairment charge									0	0
Dividend received									774,000		$ 362,000
Joint Ventures [Member]
Summary of investments
Number of consolidated joint ventures \| entity							3
Other Assets [Member]
Summary of investments
Investments, equity method									$ 10,200,000	6,400,000
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Direct minority investments not consolidated \| entity									1
Germanium materials
Summary of investments
Impairment charge								$ 1,100,000			1,100,000
One Gallium Company
Summary of investments
Impairment charge											1,100,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment \| Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments
Investments, equity method									$ 2,053,000	1,651,000
Percentage of ownership, equity method									46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method									$ 3,760,000	1,418,000
Percentage of ownership, equity method									39.00%
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Investments, equity method										0	$ 0
Percentage of ownership, equity method											25.00%
Xilingol Tongli Germanium Co. Ltd Investment \| Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Investments, equity method									$ 0
Percentage of ownership, equity method									25.00%
Xiaoyi XingAn Gallium Co., Ltd. \| Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, equity method									$ 4,095,000	2,822,000
Percentage of ownership, equity method									25.00%
Emeishan Jia Mei High Purity Metals Co., Ltd Investment \| Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments
Investments, equity method									$ 258,000	$ 485,000
Percentage of ownership, equity method									25.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)																39.00%	46.00%
ChaoYang Jin Mei Gallium Co., Ltd [Member]
Summary of investments
Percentage of ownership, consolidated method (in hundredths)					91.50%								100.00%
Percentage of ownership interest sold					8.50%
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)						100.00%	97.00%								97.00%
Percentage of outstanding shares										8.50%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)									67.00%	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 due to issuance of Tongmei's common stock				$ 1,500,000						$ 48,100,000
Investments, government approved	$ 49,000,000
Raised additional capital				$ 1,500,000
Nanjing JinMei Gallium Co., Ltd
Summary of investments
Number of new board representatives \| employee									2
Nanjing JinMei Gallium Co., Ltd \| Beijing Tongmei Xtal Technology
Summary of investments
Private equity ownership percentage										0.38%
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 Tongmei Xtal Technology
Summary of investments
Private equity ownership percentage										7.59%
Nanjing JinMei Gallium Co., Ltd Investment \| Beijing Tongmei Xtal Technology
Summary of investments
Private equity ownership percentage										0.38%
Majority-Owned Subsidiaries [Member]
Summary of investments
Investments, consolidated method									$ 5,572,000	$ 3,758,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Investments, consolidated method									$ 592,000	592,000
Additional percentage of ownership, consolidated method		12				3	2
Purchase of subsidiary shares from noncontrolling interest		$ 1,400,000				$ 413,000	$ 252,000
Number of installments \| installment		2
Payment of first installment		$ 163,000
Payment of second installment						$ 1,200,000
Noncontrolling interests														$ 0
Number of persons on board \| employee							1
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)		95.00%							85.50%									95.00%	83.00%
ChaoYang Jin Mei Gallium Co., Ltd [Member]
Summary of investments
Investments, consolidated method									$ 1,820,000	1,820,000
ChaoYang Jin Mei Gallium Co., Ltd [Member] \| ChaoYang Jin Mei Gallium Co., Ltd [Member]
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
Purchase of subsidiary shares from noncontrolling interest					$ 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 \| 3rd Party Investor
Summary of investments
Percentage ownership from issuance of shares			10.00%
Additional percentage of ownership, consolidated method										4
Purchase of subsidiary shares from noncontrolling interest										$ 1,600,000
Raised additional capital			$ 2,000,000
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)			63.00%						85.50%											70.00%
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Summary of investments
Investments, consolidated method									$ 1,814,000
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd \| ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Summary of investments
Percentage of ownership, consolidated method (in hundredths)									58.50%