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Related Party Transactions (Details)			1 Months Ended					3 Months Ended	12 Months Ended
Related Party Transactions (Details)	Dec. 25, 2020 USD ($)	Nov. 02, 2017 USD ($)	Mar. 31, 2020 USD ($)	May 31, 2019 USD ($)	Nov. 30, 2017 USD ($)	Jul. 31, 2017 USD ($) installment	Apr. 30, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2020 USD ($) ft²	Dec. 31, 2019 USD ($)	Dec. 31, 2018 USD ($)	Mar. 11, 2019	Mar. 10, 2019
Related Party Transaction [Line Items]
Proceeds from sale of previously consolidated subsidiary shares										$ 366,000
Area of leased property (in square feet) \| ft²									19,467
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Related Party Transaction [Line Items]
Additional Minority Ownership Percentage by Parent									4
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent									$ 1,600,000
Percentage of Equity Interests Sold									6.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Related Party Transaction [Line Items]
Percentage of ownership, consolidated method (in hundredths)												39.00%	46.00%
Beijing JiYa Semiconductor Material Co., Ltd
Related Party Transaction [Line Items]
Ownership (as a percent)									39.00%
Equity investment entity \| Raw materials sales to related party \| Accounts receivable \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Amounts receivable from related party									$ 0	12,000
Equity investment entity \| Raw material agency sales agreement \| Other income (expense), net [Member] \| Nanjing JinMei Gallium Co., Ltd
Related Party Transaction [Line Items]
Other income from related party									0	0	$ 24,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd \| Raw materials purchases from related party \| Accounts payable \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Amount payable to related party									0	0
Emei Shan Jiamei Materials Co., Ltd \| Raw materials purchases from related party \| Accounts payable \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Amount payable to related party									0	0
Xilingol Tongli Germanium Co. Ltd \| Raw materials purchases from related party \| Accounts payable
Related Party Transaction [Line Items]
Amount payable to related party									$ 0	0
Beijing BoYu Semiconductor Vessel Craftwork Technology Co \| Lease of land \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Area of leased property (in square feet) \| ft²									22,081
Lease term									10 years
Annual lease payment									$ 24,000
Rental increase period									3 years
Interest rate (as a percent)									5.00%
Nanjing JinMei Gallium Co., Ltd \| Related party loan \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Number of installments \| installment						3
Related party notes receivable - long term						$ 768,000
Amount payable to related party									$ 303,000	285,000
Interest rate (as a percent)						4.90%
Repayment of related party notes receivable									537,000
Executive officer \| Related party loan \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Amount of transaction			$ 141,000	$ 146,000	$ 291,000		$ 177,000
Interest rate (as a percent)			2.75%	2.75%	2.75%		2.75%
Repayment of related party notes receivable	$ 612,000							$ 180,000
Proceeds from Collection of Interest from Long Term Loans to Related Parties	$ 35,000
Executive officer \| Related party loan \| Other assets \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Related party notes receivable - current									$ 0	449,000
3rd party investor \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Related Party Transaction [Line Items]
Raised additional capital		$ 2,000,000
Percentage ownership from issuance of shares		10.00%
Additional Minority Ownership Percentage by Parent									4
Consolidation, Less than Wholly Owned Subsidiary, Parent Ownership Interest, Changes, Purchase of Interest by Parent									$ 1,600,000
3rd party investor \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Revenue from related parties									$ 300,000	$ 200,000
Raised additional capital		$ 2,000,000
Percentage ownership from issuance of shares		10.00%