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Stockholders' Equity and Stock Repurchase Program (Tables)
 3 Months Ended
Mar. 31, 2015
Stockholders' Equity and Stock Repurchase Program [Abstract]  
Consolidated statement of changes in equity
Consolidated Statements of Changes in Equity

  
Preferred
Stock
  
Common
Stock
  
Additional
PaidInCapital
  
Accumulated
Deficit
  
Other
Comprehensive
Income/(loss)
  
AXT,Inc.
stockholders’
equity
  
Noncontrolling
interests
  
Total
stockholders’
equity
 
Balance as of December 31, 2014
 
$
3,532
  
$
32
  
$
195,419
  
$
(68,393
)
 
$
7,673
  
$
138,263
  
$
6,425
  
$
144,688
 
Common stock options exercised
          
76
           
76
       
76
 
Common stock repurchased
          
(617
)
          
(617
)
      
(617
)
Stock-based compensation
          
274
           
274
       
274
 
Net (loss) income
              
(1,024
)
      
(1.024
)
  
125
   
(899
)
Dividends declared by joint ventures
                          
(83
)
  
(83
)
Change in unrealized (loss) gain on marketable securities
                  
(259
)
  
(259
)
      
(259
)
Currency translation adjustment
                  
206
   
206
   
32
   
238
 
Balance as of March 31, 2015
 
$
3,532
  
$
32
  
$
195,152
  
$
(69,417
)
 
$
7,620
  
$
136,919
  
$
6,499
  
$
143,418