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Investments in Privately-held Companies, Minority Investment Entities (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
AXT, Inc. Stockholders' Equity [Member]        
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]        
Net Revenue $ 9,631,000 $ 11,487,000 $ 29,960,000 $ 38,433,000
Gross profit 2,324,000 5,371,000 8,244,000 17,458,000
Operating income 829,000 2,289,000 4,172,000 8,377,000
Net income 805,000 1,759,000 3,546,000 6,485,000
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 $ 167,000 $ 390,000 $ 777,000 $ 1,500,000