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Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Preferred Stock [Member]
Dec. 31, 2012
Preferred Stock [Member]
Jun. 30, 2013
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Jun. 30, 2013
Additional Paid In Capital [Member]
Jun. 30, 2013
Accumulated Deficit [Member]
Jun. 30, 2013
Other Comprehensive Income/(loss) [Member]
Jun. 30, 2013
AXT, Inc. stockholders equity [Member]
Jun. 30, 2013
Noncontrolling interests [Member]
Increase (Decrease) in Stockholders' Equity [Roll Forward]                          
Balance, beginning of period     $ 150,914 [1]   $ 3,532 $ 3,532 $ 32 $ 32 $ 193,063 $ (59,047) $ 6,033 $ 143,613 $ 7,301
Common stock options exercised     272           272     272  
Common stock repurchased     (285)           (285)     (285)  
Stock-based compensation     670           670     670  
Comprehensive income:                          
Net loss (1,601) 2,427 (3,560) 5,379           (4,435)   (4,435) 875
Dividends declared by joint ventures     (2,897)                   (2,897)
Change in unrealized (loss) gain on marketable securities (30) 6 (47) 106             (47) (47)  
Currency translation adjustment     870               664 664 206
Balance, end of period $ 145,937   $ 145,937   $ 3,532 $ 3,532 $ 32 $ 32 $ 193,720 $ (63,482) $ 6,650 $ 140,452 $ 5,485
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.