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Investments in Companies (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Summary of investments [Abstract]          
Income allocated to minority interests $ 434,000 $ 1,128,000 $ 875,000 $ 2,445,000  
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income 471,000 284,000 753,000 438,000  
Percentage of Option Exercised to Sell Shares 35.00%        
Gain recognized in other income (expense) 811,000   811,000 0  
Investments in unconsolidated privately-held entities, included in other assets 325,000   325,000   392,000
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 9,641,000 7,739,000 18,914,000 14,282,000  
Gross profit 3,764,000 2,810,000 6,888,000 4,760,000  
Operating income 2,559,000 1,667,000 4,173,000 2,529,000  
Net income 2,034,000 1,276,000 3,329,000 2,018,000  
Equity Method Investments [Member]
          
Summary of investments [Abstract]          
Equity Method Investment by Parent 7,434,000   7,434,000   7,326,000
Number of consolidated joint ventures 3 3 3 3  
Income from three consolidated joint ventures 1,400,000 2,700,000 2,700,000 5,300,000  
Income allocated to minority interests 434,000 1,100,000 875,000 2,400,000  
Net income from joint ventures attributable to parent 963,000 1,600,000 1,800,000 2,800,000  
Number of equity investment entities 3   3    
Minority investment invested by consolidated joint venture, included in other assets 2,500,000 2,000,000 2,500,000 2,000,000  
Gross equity earnings (losses) from minority-owned joint ventures that are not consolidated, recorded as other income 471,000 284,000 753,000 438,000  
Majority-owned Subsidiaries [Member]
          
Summary of investments [Abstract]          
Investments, consolidated 4,333,000   4,333,000   4,333,000
Beijing JiYa Semiconductor Material Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
          
Summary of investments [Abstract]          
Investments, consolidated 3,331,000   3,331,000   3,331,000
Percentage of ownership, consolidated method (in hundredths)     46.00%    
Nanjing Jin Mei Gallium Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
          
Summary of investments [Abstract]          
Investments, consolidated 592,000   592,000   592,000
Percentage of ownership, consolidated method (in hundredths)     83.00%    
Beijing BoYu Semiconductor Vessel Craftwork Technology Co., Ltd [Member] | Majority-owned Subsidiaries [Member]
          
Summary of investments [Abstract]          
Investments, consolidated 410,000   410,000   410,000
Percentage of ownership, consolidated method (in hundredths)     70.00%    
Donghai County Dongfang High Purity Electronic Materials Co., Ltd [Member] | Equity Method Investments [Member]
          
Summary of investments [Abstract]          
Equity Method Investment by Parent 2,004,000   2,004,000   2,038,000
Percentage of ownership, equity method (in hundredths) 46.00%   46.00%    
Xilingol Tongli Germanium Co. Ltd [Member] | Equity Method Investments [Member]
          
Summary of investments [Abstract]          
Equity Method Investment by Parent 4,496,000   4,496,000   4,246,000
Percentage of ownership, equity method (in hundredths) 25.00%   25.00%    
Emeishan Jia Mei High Purity Metals Co., Ltd [Member] | Equity Method Investments [Member]
          
Summary of investments [Abstract]          
Equity Method Investment by Parent $ 934,000   $ 934,000   $ 1,042,000
Percentage of ownership, equity method (in hundredths) 25.00%   25.00%