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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (USD $)
In Thousands, unless otherwise specified
Preferred Stock [Member]
Common Stock [Member]
Additional Paid In Capital [Member]
Accumulated Deficit [Member]
Other Comprehensive Income/(Loss) [Member]
AXT, Inc. stockholders' equity [Member]
Noncontrolling interests [Member]
Total
Balance at Dec. 31, 2010 $ 3,532 $ 32 $ 190,021 $ (82,477) $ 4,652 $ 115,760 $ 4,044 $ 119,804
Balance (in shares) at Dec. 31, 2010 883 31,877            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised     637     637   637
Common stock options exercised (in shares)   251            
Stock-based compensation     896     896   896
Issuance of common stock in the form of restricted stock (in shares)   94            
Comprehensive income (loss):                
Net income (loss)       20,320   20,320 5,503 25,823
Net dividend declared by joint ventures             (1,636) (1,636)
Change in unrealized (loss) gain on marketable securities         (161) (161)   (161)
Currency translation adjustment         1,327 1,327 359 1,686
Balance at Dec. 31, 2011 3,532 32 191,554 (62,157) 5,818 138,779 8,270 147,049
Balance (in shares) at Dec. 31, 2011 883 32,222            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised     294     294   294
Common stock options exercised (in shares)   136            
Stock-based compensation     1,215     1,215   1,215
Issuance of common stock in the form of restricted stock (in shares)   113            
Comprehensive income (loss):                
Net income (loss)       3,110   3,110 3,040 6,150
Net dividend declared by joint ventures             (4,086) (4,086)
Change in unrealized (loss) gain on marketable securities         85 85   85
Currency translation adjustment         130 130 77 207
Balance at Dec. 31, 2012 3,532 32 193,063 (59,047) 6,033 143,613 7,301 150,914
Balance (in shares) at Dec. 31, 2012 883 32,471            
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Common stock options exercised     532     532   532
Common stock options exercised (in shares)   331            
Common stock repurchased     (716)     (716)   (716)
Common stock repurchased (in shares)   (285)            
Stock-based compensation     1,277     1,277   1,277
Issuance of common stock in the form of restricted stock (in shares)   88            
Comprehensive income (loss):                
Net income (loss)       (7,958)   (7,958) 1,145 (6,813)
Net dividend declared by joint ventures             (2,898) (2,898)
Change in unrealized (loss) gain on marketable securities         1,682 1,682   1,682
Currency translation adjustment         1,238 1,238 330 1,568
Balance at Dec. 31, 2013 $ 3,532 $ 32 $ 194,156 $ (67,005) $ 8,953 $ 139,668 $ 5,878 $ 145,546
Balance (in shares) at Dec. 31, 2013 883 32,605