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Investments in Privately-Held Companies (Details)			1 Months Ended	3 Months Ended		12 Months Ended
Investments in Privately-Held Companies (Details)	Jun. 15, 2018 USD ($) installment	Nov. 02, 2017 USD ($)	Sep. 30, 2018 USD ($) employee entity	Mar. 31, 2019 USD ($) employee subsidiary entity item	Mar. 31, 2018 USD ($) subsidiary entity	Dec. 31, 2018 USD ($)	Mar. 11, 2019	Mar. 10, 2019	Aug. 31, 2018	Jun. 14, 2018	Nov. 01, 2017
Summary of investments [Abstract]
Direct investments \| item				6
Indirect investments \| item				1
Investments, equity method				$ 4,276,000		$ 3,958,000
Proceeds from sale of previously consolidated subsidiary shares				366,000
Gain on deconsolidation				175,000
Additional percentage of ownership, consolidated method			2
Remainder portion of payment				$ 1,176,000		1,147,000
Number of persons on board \| employee			1
Number of consolidated joint ventures \| subsidiary				1	1
Net income attributable to noncontrolling interests				$ 81,000	$ 315,000
Direct minority investments not consolidated \| entity				4
Impairment charge				$ 1,100,000		0
Impaired entities \| entity				1
Joint Ventures
Summary of investments [Abstract]
Indirect investments \| entity				1
Number of consolidated joint ventures \| entity			3	3	3
Income from consolidated joint ventures				$ 700,000	$ 1,400,000
Net income attributable to noncontrolling interests				81,000	315,000
Net income from joint ventures attributable to parent				600,000	$ 1,100,000
Other assets
Summary of investments [Abstract]
Investments, equity method				6,900,000		8,400,000
Other assets \| Joint Ventures
Summary of investments [Abstract]
Value of indirectly owned minority investments in privately-held companies				$ 2,600,000		4,500,000
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments [Abstract]
Percentage of ownership, equity method (in hundredths)				25.00%
Direct minority investments not consolidated \| entity				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				$ 1,459,000		1,416,000
Percentage of ownership, equity method (in hundredths)				46.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment \| Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments [Abstract]
Investments, equity method				$ 2,027,000
Percentage of ownership, equity method (in hundredths)				39.00%
Xilingol Tongli Germanium Co. Ltd Investment \| Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments [Abstract]
Investments, equity method				$ 0		1,700,000
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				$ 790,000		842,000
Percentage of ownership, equity method (in hundredths)				25.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments [Abstract]
Percentage of ownership, consolidated method (in hundredths)							39.00%	46.00%
Nanjing JinMei Gallium Co., Ltd
Summary of investments [Abstract]
Number of new board representatives \| employee				2
Beijing Boyu Semiconductor Vessel Craftwork Technology Co Ltd
Summary of investments [Abstract]
Number of persons on board \| employee				2
Majority-Owned Subsidiaries
Summary of investments [Abstract]
Investments, consolidated method				$ 1,938,000		5,269,000
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%					95.00%	83.00%
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated method						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%
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%