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Investments in Privately-Held Raw Material Companies (Details)				1 Months Ended					3 Months Ended			9 Months Ended		12 Months Ended
	Jan. 25, 2021 USD ($)	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($) employee	Jun. 30, 2021 USD ($)	Jan. 31, 2021 USD ($)	Aug. 31, 2020 USD ($)	May 31, 2019 USD ($)	Sep. 30, 2018 USD ($) employee entity	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2021 USD ($) employee entity	Sep. 30, 2020 USD ($)	Dec. 31, 2020 USD ($)	Jul. 31, 2020	Dec. 31, 2019	Jun. 01, 2019 USD ($)	Apr. 30, 2019	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017
Summary of investments
Investments, equity method									$ 9,340,000			$ 9,340,000		$ 6,376,000
Increase in redeemable noncontrolling interests due to issuance of Tongmei's common stock					$ 1,500,000							1,514,000
Investments, government approved	$ 49,000,000
Noncontrolling interests									17,814,000			17,814,000		15,350,000
Remainder portion of payment														1,439,000
Number of persons on board \| employee								1
Impairment charge									0	$ 0	$ 1,100,000	0	$ 0
Dividend received												774,000
Joint Ventures
Summary of investments
Number of consolidated joint ventures \| entity								3
Other assets
Summary of investments
Investments, equity method									9,300,000			$ 9,300,000		6,400,000
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Direct minority investments not consolidated \| entity												1
Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Dividend received				$ 774,000,000
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									$ 1,961,000			$ 1,961,000		1,651,000
Percentage of ownership, equity method (in hundredths)									46.00%			46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments
Investments, equity method									$ 3,333,000			$ 3,333,000		1,418,000
Percentage of ownership, equity method (in hundredths)									39.00%			39.00%
Xilingol Tongli Germanium Co. Ltd Investment \| Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments
Investments, equity method									$ 0			$ 0
Percentage of ownership, equity method (in hundredths)									25.00%			25.00%
Xiaoyi XingAn Gallium Co., Ltd. \| Xiaoyi XingAn Gallium Co., Ltd.
Summary of investments
Investments, consolidated method									$ 3,727,000			$ 3,727,000		2,822,000
Percentage of ownership, equity method (in hundredths)									25.00%			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									$ 319,000			$ 319,000		$ 485,000
Percentage of ownership, equity method (in hundredths)									25.00%			25.00%
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)							100.00%											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%		63.00%
Percentage of outstanding shares														33.00%
Beijing Tongmei Xtal Technology
Summary of investments
Percentage of ownership, consolidated method (in hundredths)									85.50%			85.50%
Percentage of outstanding shares	7.28%								14.50%			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
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%
Majority-Owned Subsidiaries
Summary of investments
Investments, consolidated method									$ 5,572,000			$ 5,572,000		$ 3,758,000
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Investments, consolidated method									$ 592,000			$ 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
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments
Percentage of ownership, consolidated method (in hundredths)		95.00%						97.00%	85.50%			85.50%							95.00%	83.00%
ChaoYang JinMei Gallium Co., Ltd[member]
Summary of investments
Investments, consolidated method									$ 1,820,000			$ 1,820,000		1,820,000
ChaoYang JinMei Gallium Co., Ltd[member] \| ChaoYang JinMei Gallium Co., Ltd[member]
Summary of investments
Percentage of ownership, consolidated method (in hundredths)						91.50%			85.50%			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		$ 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%			85.50%									70.00%
ChaoYang XinMei High Purity Semiconductor Materials Co., Ltd
Summary of investments
Investments, consolidated method									$ 1,814,000			$ 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%			58.50%