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Investments in Companies, Minority Investment Entities (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
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 $ 13,466,000 $ 9,641,000 $ 26,946,000 $ 18,914,000
Gross profit 8,124,000 3,764,000 12,087,000 6,888,000
Operating income 3,424,000 2,559,000 6,088,000 4,173,000
Net income 2,607,000 2,034,000 4,726,000 3,329,000
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 $ 625,000 $ 471,000 $ 1,100,000 $ 753,000