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Investments in Privately-held Companies (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of investments [Abstract]
Income allocated to minority interests	$ 1,145,000	$ 3,040,000	$ 5,503,000
Equity investments classified as other assets	14,801,000	14,275,000
AXT, Inc [Member]
Summary of investments [Abstract]
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	6,315,000	5,665,000	2,900,000
Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	7,537,000	7,326,000
Number of equity investment entities	3	3
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	270,000	379,000	520,000
Net income generated by all joint ventures, consolidated and equity method investments	2,600,000	4,700,000	7,600,000
Equity investments classified as other assets	7,500,000	7,300,000
Minority investment in consolidated joint venture, included in other assets	3,400,000	2,000,000
Joint Ventures [Member]
Summary of investments [Abstract]
Number of consolidated joint ventures	3	3	3
Income from three consolidated joint ventures	3,500,000	7,400,000	12,500,000
Income allocated to minority interests	1,100,000	3,000,000	5,500,000
Net income from joint ventures attributable to parent	2,400,000	4,400,000	7,000,000
Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	5,269,000	4,333,000
Minority Investment Entities [Member]
Summary of investments [Abstract]
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income	1,377,000	1,281,000	741,000
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
Summary of investments [Abstract]
Investments, consolidated	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
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	410,000
Percentage of ownership, consolidated method (in hundredths)	70.00%
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	4,692,000	4,246,000
Percentage of ownership, equity method (in hundredths)	25.00%
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	1,900,000	2,038,000
Percentage of ownership, equity method (in hundredths)	46.00%
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member]
Summary of investments [Abstract]
Equity Method Investment by Parent	$ 945,000	$ 1,042,000
Percentage of ownership, equity method (in hundredths)	25.00%

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