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Investments in Companies, Minority Investment Entities (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
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 revenue $ 11,004,000 $ 13,466,000 $ 20,329,000 $ 26,946,000
Gross profit 3,625,000 8,124,000 5,920,000 12,087,000
Operating income 2,292,000 3,424,000 3,343,000 6,088,000
Net income 1,784,000 2,607,000 2,741,000 4,726,000
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 $ 410,000 $ 625,000 $ 610,000 $ 1,100,000