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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, 2017 USD ($)	Dec. 31, 2017 USD ($) ft² installment	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Related party notes receivable - long term									$ 157,000
Area of leased property (in square feet) \| ft²								19,467
Repayment of related party notes receivable								$ 169,000
Nanjing JinMei Gallium Co., Ltd
Related Party Transaction [Line Items]
Estimated land and construction costs				$ 6,000,000
Other assets
Related Party Transaction [Line Items]
Amounts due from related party, noncurrent								$ 1,200,000	1,400,000
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 9 months 29 days
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								$ 2,100,000	1,800,000
Equity investment entity \| Raw materials purchases from related party \| Accounts payable \| Beijing Tongmei Xtal Technology
Related Party Transaction [Line Items]
Amount payable to related party								0	146,000
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								334,000	313,000
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								635,000	156,000
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								3,000	1,000
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
Related party notes receivable - long term								$ 0	50,000
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]
Related party notes receivable - long term								0	107,000
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								0	210,000
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								370,000	377,000
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								219,000	246,000
Beijing Kaide Quartz Co. Ltd \| Raw materials purchases from related party \| Accounts payable
Related Party Transaction [Line Items]
Amount payable to related party									323,000
Beijing Kaide Quartz Co. Ltd \| Raw materials sales to related party \| Accounts payable
Related Party Transaction [Line Items]
Amount payable to related party								$ 708,000
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
Interest rate (as a percent)				4.90%
Executive officer \| Related party loan \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Amount of transaction			$ 307,000		$ 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								$ 307,000
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									179,000
3rd party investor \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co
Related Party Transaction [Line Items]
Revenue from related parties								$ 1,200,000	$ 653,000
Investments, consolidated	$ 2,000,000
Percentage of ownership, consolidated method (in hundredths)	10.00%