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Investments in Privately Held Companies - Minority Investment Entities (Details) - USD ($)
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
AXT, Inc. Stockholders' Equity    
Summarized income information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]    
Net Revenue $ 3,516,000 $ 9,325,000
Gross profit 50,000 2,295,000
Operating income (loss) (1,184,000) 1,051,000
Net income (loss) (1,774,000) 957,000
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 (loss) $ (456,000) $ 200,000