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Investments in Companies (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2015 USD ($) EquityMethodInvestee JointVenture	Jun. 30, 2014 USD ($) JointVenture	Jun. 30, 2015 USD ($) EquityMethodInvestee JointVenture	Jun. 30, 2014 USD ($) JointVenture	Dec. 31, 2014 USD ($) EquityMethodInvestee
Summary of investments [Abstract]
Income allocated to minority interests	$ 127,000	$ 242,000	$ 252,000	$ 447,000
Equity investments classified as other assets	15,000,000		15,000,000		$ 14,975,000
Investments in unconsolidated privately-held entities, included in other assets					200,000
AXT, Inc. [Member]
Summary of investments [Abstract]
Gross equity earnings from minority-owned joint ventures that are not consolidated, recorded as other income	1,784,000	2,607,000	2,741,000	4,726,000
Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	$ 8,251,000		$ 8,251,000		$ 8,095,000
Number of equity investment entities | EquityMethodInvestee	3		3		3
Equity investments classified as other assets	$ 8,300,000		$ 8,300,000		$ 8,100,000
Gross equity earnings from minority-owned joint ventures that are not consolidated, recorded as other income	$ 410,000	$ 625,000	$ 610,000	$ 1,100,000
Joint Ventures [Member]
Summary of investments [Abstract]
Number of consolidated joint ventures | JointVenture	3	3	3	3
Income from three consolidated joint ventures	$ 600,000	$ 1,100,000	$ 1,200,000	$ 1,800,000
Income allocated to minority interests	127,000	242,000	252,000	447,000
Net income from joint ventures attributable to parent	520,000	$ 847,000	947,000	$ 1,400,000
Minority investment in consolidated joint venture, included in other assets	4,400,000		4,400,000		4,000,000
Majority-Owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	5,269,000		5,269,000		5,269,000
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-Owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	3,331,000		$ 3,331,000		3,331,000
Percentage of ownership, consolidated method (in hundredths)			46.00%
Nanjing Jin Mei Gallium Co., Ltd [Member] | Majority-Owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	592,000		$ 592,000		592,000
Percentage of ownership, consolidated method (in hundredths)			83.00%
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] | Majority-Owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	1,346,000		$ 1,346,000		1,346,000
Percentage of ownership, consolidated method (in hundredths)			70.00%
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	$ 1,652,000		$ 1,652,000		1,723,000
Percentage of ownership, equity method (in hundredths)	46.00%		46.00%
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	$ 5,556,000		$ 5,556,000		5,351,000
Percentage of ownership, equity method (in hundredths)	25.00%		25.00%
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity method investment by parent	$ 1,043,000		$ 1,043,000		$ 1,021,000
Percentage of ownership, equity method (in hundredths)	25.00%		25.00%

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