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Investments in Privately-held Companies (Details)			1 Months Ended	12 Months Ended
Investments in Privately-held Companies (Details)	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($)	Sep. 30, 2018 USD ($) employee entity	Dec. 31, 2018 USD ($) employee subsidiary entity item	Dec. 31, 2017 USD ($) entity company item	Dec. 31, 2016 USD ($) item	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017	Mar. 31, 2017 USD ($)
Summary of investments [Abstract]
Direct investments \| item				6
Indirect investments \| item				4
Investments, equity method				$ 8,422,000	$ 9,849,000
Additional percentage of ownership, consolidated method			2
Purchase of subsidiary shares from noncontrolling interest				187,000
Payment of first installment				415,000
Remainder portion of payment				$ 1,147,000
Number of persons on board \| employee			1
Number of consolidated joint ventures \| subsidiary				3
Net income (loss) attributable to noncontrolling interests				$ 1,355,000	$ (87,000)	$ (670,000)
Direct minority investments not consolidated \| entity				3	3
Impairment charge				$ 0
Impaired entities \| entity				1
Joint Ventures
Summary of investments [Abstract]
Number of consolidated joint ventures			3	3	3	3
Income (loss) from consolidated joint ventures				$ 5,500,000	$ 2,100,000	$ 100,000
Net income (loss) attributable to noncontrolling interests				1,400,000	(100,000)	(700,000)
Net income (loss) from joint ventures attributable to parent				4,100,000	2,200,000	800,000
Net income from consolidated joint ventures and equity investment entities				2,600,000	1,300,000	(400,000)
Other assets
Summary of investments [Abstract]
Investments, equity method				8,400,000	9,800,000
Other assets \| Joint Ventures
Summary of investments [Abstract]
Value of indirectly owned minority investments in privately-held companies				4,500,000	4,300,000
Variable Interest Entity
Summary of investments [Abstract]
Investments, equity method				3,958,000	5,578,000
One Gallium Company
Summary of investments [Abstract]
Investments, equity method										$ 0
Impairment charge					$ 313,000	$ 0
Number of gallium companies with impairment charge \| company					1
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment \| Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments [Abstract]
Investments, equity method				$ 1,416,000	$ 1,473,000
Percentage of ownership, equity method (in hundredths)				46.00%
Xilingol Tongli Germanium Co. Ltd Investment \| Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments [Abstract]
Investments, equity method				$ 1,700,000	3,190,000
Percentage of ownership, equity method (in hundredths)				25.00%
Emeishan Jia Mei High Purity Metals Co., Ltd Investment \| Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments [Abstract]
Investments, equity method				$ 842,000	915,000
Percentage of ownership, equity method (in hundredths)				25.00%
Beijing JiYa Semiconductor Material Co., Ltd
Summary of investments [Abstract]
Indirect investments \| entity				3
Number of new board representatives \| employee				1
Employee duration				27 years
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd
Summary of investments [Abstract]
Number of new board representatives \| employee				2
Jinmei
Summary of investments [Abstract]
Indirect investments \| entity				1
Number of new board representatives \| employee				2
Majority-Owned Subsidiaries
Summary of investments [Abstract]
Investments, consolidated method				$ 5,269,000	5,269,000
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated method				$ 3,331,000	3,331,000
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments [Abstract]
Percentage of ownership, consolidated method (in hundredths)				46.00%
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated method				$ 592,000	592,000
Additional percentage of ownership, consolidated method	12
Purchase of subsidiary shares from noncontrolling interest	$ 1,400,000		$ 252,000
Number of installments \| installment	2
Payment of first installment	$ 163,000
Remainder portion of payment				$ 1,200,000
Nanjing JinMei Gallium Co., Ltd Investment \| Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments [Abstract]
Percentage of ownership, consolidated method (in hundredths)			97.00%	97.00%			95.00%	83.00%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated method				$ 1,346,000	$ 1,346,000
Gain (loss) from equity transaction		$ 0
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment \| 3rd party investor
Summary of investments [Abstract]
Percentage ownership from issuance of shares		10.00%
Raised additional capital		$ 2,000,000
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment \| Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments [Abstract]
Percentage of ownership, consolidated method (in hundredths)				63.00%					70.00%