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Stockholders' Equity (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Preferred Stock [Member]
Dec. 31, 2012
Preferred Stock [Member]
Sep. 30, 2013
Common Stock [Member]
Dec. 31, 2012
Common Stock [Member]
Sep. 30, 2013
Additional Paid In Capital [Member]
Sep. 30, 2013
Accumulated Deficit [Member]
Sep. 30, 2013
Other Comprehensive Income/(loss) [Member]
Sep. 30, 2013
AXT, Inc. stockholders equity [Member]
Sep. 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     278           278     272  
Common stock repurchased     (287)           (287)     (287)  
Stock-based compensation     1,004           1,004     1,004  
Comprehensive income:                          
Net loss (2,065) 1,444 (5,625) 6,823           (6,730)   (6,730) 1,105
Dividends declared by joint ventures     (2,898)                   (2,898)
Change in unrealized (loss) gain on marketable securities 73 9 26 115             26 26  
Currency translation adjustment     1,177               929 929 248
Balance, end of period $ 144,589   $ 144,589   $ 3,532 $ 3,532 $ 32 $ 32 $ 194,058 $ (65,777) $ 6,988 $ 138,833 $ 5,756
[1] The condensed consolidated balance sheet at December 31, 2012 has been derived from the audited consolidated financial statements at that date.