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Related Party Transactions (Details)		1 Months Ended					3 Months Ended				6 Months Ended
Related Party Transactions (Details)	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, 2020 USD ($) ft²	Jun. 30, 2019 USD ($)	Mar. 31, 2019 USD ($)	Jun. 30, 2017 USD ($)	Jun. 30, 2020 USD ($) ft²	Jun. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)	Mar. 11, 2019	Mar. 10, 2019
Related Party Transaction [Line Items]
Proceeds from sale of previously consolidated subsidiary shares									$ 366,000		$ 366,000
Area of leased property (in square feet) \| ft²							19,467				19,467
Beijing JiYa Semiconductor Material Co., Ltd Investment
Related Party Transaction [Line Items]
Percentage of ownership, consolidated method (in hundredths)														39.00%	46.00%
Equity investment entity \| Raw materials sales to related party \| Accounts receivable \| Beijing JiYa Semiconductor Material Co., Ltd
Related Party Transaction [Line Items]
Amounts receivable from related party							$ 0				$ 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			0	$ 0
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							126,000				126,000		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		0
Xilingol Tongli Germanium 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		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				22,081
Lease term							10 years				10 years
Annual lease payment											$ 24,000
Increase in annual lease payment at each third year anniversary (in hundredths)							5.00%				5.00%
Rental increase period											3 years
Nanjing JinMei Gallium Co., Ltd \| Related party loan \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Amount of transaction					$ 768,000
Number of installments \| installment					3
Amount payable to related party							$ 287,000				$ 287,000		285,000
Interest rate (as a percent)					4.90%
Repayment of related party notes receivable											483,000
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										$ 180,000
Executive officer \| Related party loan \| Other assets \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Related party notes receivable - current							591,000				591,000		$ 449,000
3rd party investor \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Revenue from related parties							$ 12,000	$ 19,000			$ 300,000	$ 100,000
Raised additional capital	$ 2,000,000
Percentage ownership from issuance of shares	10.00%