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Related Party Transactions (Details)		1 Months Ended				3 Months Ended			9 Months Ended
Related Party Transactions (Details)	Nov. 02, 2017 USD ($)	May 31, 2019 USD ($)	Nov. 30, 2017 USD ($)	Jul. 31, 2017 USD ($) installment	Apr. 30, 2016 USD ($)	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($)	Jun. 30, 2017 USD ($)	Sep. 30, 2019 USD ($) ft²	Sep. 30, 2018 USD ($)	Dec. 31, 2019 USD ($)	Mar. 11, 2019	Mar. 10, 2019	Dec. 31, 2018 USD ($)
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			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]
Amount payable to related party						$ 0			$ 0					$ 0
Equity investment entity \| Raw material agency sales agreement \| Other income (expense), net \| Nanjing JinMei Gallium Co., Ltd
Related Party Transaction [Line Items]
Other income from related party						0	$ 20,000		0	$ 21,000
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					59,000
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					316,000
Interest rate (as a percent)				4.90%
Repayment of related party notes receivable									464,000
Nanjing JinMei Gallium Co., Ltd \| Minimum \| Forecast
Related Party Transaction [Line Items]
Investment in new facility											$ 2,500,000
Nanjing JinMei Gallium Co., Ltd \| Maximum \| Forecast
Related Party Transaction [Line Items]
Investment in new facility											$ 3,500,000
Executive officer \| Related party loan \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Amount of transaction		$ 146,000	$ 291,000		$ 177,000
Interest rate (as a percent)		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						439,000			439,000					$ 299,000
3rd party investor \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Revenue from related parties						$ 0	$ 37,000		$ 100,000	$ 1,400,000
Raised additional capital	$ 2,000,000
Percentage ownership from issuance of shares	10.00%