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Investments in Privately-held Companies, Minority Investment Entities (Details) - USD ($)
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
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 $ 36,259,000 $ 47,824,000 $ 41,257,000
Gross profit 8,327,000 21,436,000 13,836,000
Operating income 2,494,000 9,046,000 8,174,000
Net income 2,371,000 6,765,000 6,315,000
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 43,000 569,000 270,000
Summarized balance sheet information of all the minority investment entities that are not consolidated and accounted for under the equity method [Abstract]      
Current assets 32,097,000 31,482,000  
Noncurrent assets 35,917,000 39,275,000  
Current liabilities 18,185,000 19,923,000  
Noncurrent liabilities 571,000 169,000  
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 Revenue 9,112,000 11,887,000 10,240,000
Gross profit 1,954,000 5,340,000 3,328,000
Operating income 494,000 2,059,000 1,820,000
Net income 462,000 1,528,000 1,377,000
Minority investment entities      
Dividends received 305,000 327,000 $ 396,000
Undistributed retained earnings $ 6,600,000 $ 6,500,000