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Related Party Transactions (Details)			1 Months Ended				3 Months Ended	12 Months Ended
Related Party Transactions (Details)	Nov. 02, 2017 USD ($)	Aug. 31, 2011 USD ($) item	Nov. 30, 2017 USD ($)	Jul. 31, 2017 USD ($) installment	Apr. 30, 2016 USD ($)	Apr. 30, 2014 USD ($)	Jun. 30, 2018 USD ($)	Dec. 31, 2018 USD ($) ft² installment	Dec. 31, 2017 USD ($)	Dec. 31, 2019 USD ($)
Related Party Transaction [Line Items]
Area of leased property (in square feet) \| ft²								19,467
Repayment of related party notes receivable									$ 169,000
Other assets
Related Party Transaction [Line Items]
Amounts due from related party, noncurrent								$ 1,000,000	1,200,000
Equity investment entity \| Beijing JiYa Semiconductor Material Co., Ltd
Related Party Transaction [Line Items]
Ownership (as a percent)								10.00%
Revenue from related parties									0
Equity investment entity \| Related party loan \| Beijing JiYa Semiconductor Material Co., Ltd
Related Party Transaction [Line Items]
Amount of transaction		$ 1,600,000
Number of equity method investees to whom loan was granted \| item		1
Term of loan								2 years 10 months
Number of installments \| installment								3
Equity investment entity \| Raw materials purchases from related party \| Accounts payable \| Beijing JiYa Semiconductor Material Co., Ltd
Related Party Transaction [Line Items]
Amount payable to related party								$ 1,900,000	2,100,000
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								316,000	334,000
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	635,000
Equity investment entity \| Raw material agency sales agreement \| Other (expense) income, net \| Nanjing JinMei Gallium Co., Ltd
Related Party Transaction [Line Items]
Other income from related party								24,000	$ 3,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd \| Related party loan \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Amount of transaction						$ 46,000
Interest rate (as a percent)									6.15%
Repayment of related party notes receivable									$ 55,000
Donghai County Dongfang High Purity Electronic Materials Co., Ltd \| Raw materials purchases from related party \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Repayment of related party notes receivable									114,000
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								59,000	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	370,000
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	219,000
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								$ 316,000
Interest rate (as a percent)				4.90%
Repayment of related party notes receivable								453,000
Nanjing JinMei Gallium Co., Ltd \| Minimum
Related Party Transaction [Line Items]
Investment in new facility										$ 2,500,000
Nanjing JinMei Gallium Co., Ltd \| Maximum
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			$ 291,000		$ 177,000
Interest rate (as a percent)			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								299,000
Executive officer \| Related party loan \| Prepaid expenses and other current assets \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Related party notes receivable - current									291,000
3rd party investor \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Revenue from related parties								$ 1,500,000	$ 1,200,000
Raised additional capital	$ 2,000,000
Percentage ownership from issuance of shares	10.00%