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Area of a real estate property.

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Amounts due from parties associated with the reporting entity as evidenced by a written promise to pay, due after 1 year (or 1 business cycle).

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The cash inflow associated with collection, whether partial or full, of long-term loans to a related party. Alternate caption: Proceeds from Advances to Affiliates.

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Identify the stated interest rate per the agreement, for example, leasing and debt arrangements between related parties.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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Related Party Transactions (Details)	1 Months Ended				3 Months Ended			9 Months Ended
Related Party Transactions (Details)	Jul. 31, 2017 USD ($) installment	Apr. 30, 2016 USD ($)	Apr. 30, 2014 USD ($)	Aug. 31, 2011 USD ($) item	Sep. 30, 2017 USD ($) ft² installment	Jun. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) ft² installment	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Related Party Transaction [Line Items]
Related party notes receivable - long term										$ 157,000
Additional revenue					$ 28,168,000		$ 21,872,000	$ 72,341,000	$ 61,080,000
Area of leased property (in square feet) \| ft²					19,467			19,467
Repayment of related party notes receivable								$ 108,000
Related party notes receivable - current					$ 57,000			57,000
Nanjing JinMei Gallium Co., Ltd
Related Party Transaction [Line Items]
Estimated land and construction costs	$ 6,000,000
Equity investment entity \| Beijing JiYa Semiconductor Material Co., Ltd
Related Party Transaction [Line Items]
Additional revenue								$ 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			3
Equity investment entity \| Related party loan \| Other Assets [Member] \| Beijing JiYa Semiconductor Material Co., Ltd
Related Party Transaction [Line Items]
Related party notes receivable - long term					$ 1,200,000			$ 1,200,000		1,400,000
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					1,800,000			1,800,000		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			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					326,000			326,000		313,000
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					2,000		$ 0	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			$ 44,000
Related party notes receivable - long term					0			$ 0		50,000
Interest rate (as a percent)								6.15%
Repayment of related party notes receivable						$ 53,000
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					57,000			$ 57,000		107,000
Repayment of related party notes receivable					55,000
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		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					0			0		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					433,000,000,000			433,000,000,000		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					$ 579,000			$ 579,000		323,000
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			22,081
Lease term								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]
Number of installments \| installment	3
Related party notes receivable - long term	$ 751,000
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		$ 177,000
Interest rate (as a percent)		2.75%
Repayment of related party notes receivable						$ 180,000
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					$ 0			$ 0		$ 179,000