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Investments in Privately Held Companies (Details)	3 Months Ended
	Mar. 31, 2017 USD ($) employee item	Mar. 31, 2017 USD ($) employee item	Mar. 31, 2017 USD ($) employee item	Mar. 31, 2017 USD ($) employee entity item	Mar. 31, 2017 USD ($) employee company item	Mar. 31, 2017 USD ($) employee item	Mar. 31, 2017 USD ($) employee item	Mar. 31, 2016 USD ($) item	Dec. 31, 2016 USD ($)
Summary of investments [Abstract]
Direct investments | item						6
Indirect investments | item						4
Investments in privately-held companies	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000		$ 6,599,000
Equity method investments				3	7
Net loss attributable to noncontrolling interests							(240,000)	$ (109,000)
Equity investments classified as other assets	11,853,000	11,853,000	11,853,000	$ 11,853,000	$ 11,853,000	11,853,000	11,853,000		12,842,000
Minority investments not consolidated accounted for under equity method				3	7
Net income							(1,705,000)	$ (1,708,000)
Investments held	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000	$ 6,274,000		6,599,000
Joint Ventures [Member]
Summary of investments [Abstract]
Indirect investments | entity				4
Number of consolidated joint ventures | item	3	3	3	3	3	3	3	3
Income (loss) from consolidated joint ventures							$ (12,000)	$ (175,000)
Net loss attributable to noncontrolling interests							240,000	109,000
Net income (loss) from joint ventures attributable to parent							228,000	(66,000)
Other Assets [Member]
Summary of investments [Abstract]
Investments in privately-held companies	$ 10,400,000	$ 10,400,000	$ 10,400,000	$ 10,400,000	$ 10,400,000	$ 10,400,000	10,400,000		11,300,000
Investments held	10,400,000	10,400,000	10,400,000	10,400,000	10,400,000	10,400,000	10,400,000		11,300,000
Other Assets [Member] | Joint Ventures [Member]
Summary of investments [Abstract]
Minority investment in consolidated joint venture, included in other assets	4,100,000	4,100,000	4,100,000	4,100,000	4,100,000	4,100,000	4,100,000		4,700,000
Beijing JiYa Semiconductor Material Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated	$ 3,331,000	$ 3,331,000	$ 3,331,000	$ 3,331,000	$ 3,331,000	$ 3,331,000	$ 3,331,000		3,331,000
Percentage of ownership, consolidated method (in hundredths)		46.00%
Number of persons on board | employee	1	1	1	1	1	1	1
Employee duration	27 years
Nanjing JinMei Gallium Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated	$ 592,000	$ 592,000	$ 592,000	$ 592,000	$ 592,000	$ 592,000	$ 592,000		592,000
Percentage of ownership, consolidated method (in hundredths)		83.00%
Number of new board representatives | employee			2
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd Investment
Summary of investments [Abstract]
Investments, consolidated	1,346,000	$ 1,346,000	$ 1,346,000	1,346,000	1,346,000	1,346,000	1,346,000		1,346,000
Percentage of ownership, consolidated method (in hundredths)		70.00%
Number of new board representatives | employee			2
Donghai County Dongfang High Purity Electronic Materials Co., Ltd Investment
Summary of investments [Abstract]
Investments in privately-held companies	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000		1,498,000
Percentage of ownership, equity method (in hundredths)	46.00%	46.00%	46.00%	46.00%	46.00%	46.00%	46.00%
Investments held	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000	$ 1,352,000		1,498,000
Xilingol Tongli Germanium Co. Ltd Investment
Summary of investments [Abstract]
Investments in privately-held companies	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000		4,000,000
Percentage of ownership, equity method (in hundredths)	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%
Investments held	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000	$ 4,036,000		4,000,000
Emeishan Jia Mei High Purity Metals Co., Ltd Investment
Summary of investments [Abstract]
Investments in privately-held companies	$ 886,000	$ 886,000	$ 886,000	$ 886,000	$ 886,000	$ 886,000	$ 886,000		1,101,000
Percentage of ownership, equity method (in hundredths)	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%	25.00%
Investments held	$ 886,000	$ 886,000	$ 886,000	$ 886,000	$ 886,000	$ 886,000	$ 886,000		1,101,000
Seven Minority Investments
Summary of investments [Abstract]
Equity method investments | entity				7
Minority investments not consolidated accounted for under equity method | entity				7
Net income							(933,000)	(456,000)
One Gallium Company
Summary of investments [Abstract]
Investments in privately-held companies	0	0	0	$ 0	0	0	0
Impairment charge							313,000	$ 0
Investments held	0	0	0	$ 0	0	0	0
Beijing JiYa Semiconductor Material Co., Ltd
Summary of investments [Abstract]
Indirect investments | entity				3
Jinmei [Member]
Summary of investments [Abstract]
Indirect investments | entity				1
Majority-Owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	$ 5,269,000	$ 5,269,000	$ 5,269,000	$ 5,269,000	$ 5,269,000	$ 5,269,000	$ 5,269,000		$ 5,269,000

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