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Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Preferred Stock [Member]
Dec. 31, 2011
Preferred Stock [Member]
Jun. 30, 2012
Common Stock [Member]
Dec. 31, 2011
Common Stock [Member]
Jun. 30, 2012
Additional Paid In Capital [Member]
Jun. 30, 2012
Accumulated Deficit [Member]
Jun. 30, 2012
Other Comprehensive Income/(loss) [Member]
Jun. 30, 2012
AXT, Inc. stockholders equity [Member]
Jun. 30, 2012
Noncontrolling interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Balance, beginning of period     $ 147,049 [1]   $ 3,532 $ 3,532 $ 32 $ 32 $ 191,554 $ (62,157) $ 5,818 $ 138,779 $ 8,270
Common stock options exercised     219           219     219  
Stock-based compensation     573           573     573  
Comprehensive income:                          
Net income 2,427 9,068 5,379 14,355           2,934   2,934 2,445
Net dividends declared by joint ventures     (4,039)                   (4,039)
Change in unrealized (loss) gain on marketable securities 6 20 106 (27)             106 106  
Currency translation adjustment     311               239 239 72
Balance, end of period $ 149,598   $ 149,598   $ 3,532 $ 3,532 $ 32 $ 32 $ 192,346 $ (59,223) $ 6,163 $ 142,850 $ 6,748
[1] The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.