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Investments in Privately-held Companies, Minority Investment Entities (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
AXT, Inc [Member]
      
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]      
Net Sales $ 41,257,000 $ 32,858,000 $ 21,340,000
Gross profit 13,836,000 11,057,000 7,576,000
Operating income 8,174,000 6,310,000 3,819,000
Net income 6,315,000 5,665,000 2,900,000
Equity Method Investments [Member]
      
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]      
Net income 270,000 379,000 520,000
Summarized balance sheet information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]      
Current assets 22,139,000 20,594,000  
Noncurrent assets 38,941,000 37,555,000  
Current Liabilities 15,289,000 20,772,000  
Noncurrent liabilities 2,296,000 2,873,000  
Minority Investment Entities [Member]
      
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]      
Net Sales 10,240,000 8,091,000 5,196,000
Gross profit 3,328,000 2,643,000 1,814,000
Operating income 1,820,000 1,409,000 863,000
Net income 1,377,000 1,281,000 741,000
Minority investment entities      
Dividends received 396,000 277,000 357,000
Undistributed retained earnings $ 5,300,000 $ 4,300,000 $ 3,300,000