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Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 2013
Stockholders' Equity [Abstract]  
Consolidated statements of changes in equity
Consolidated Statements of Changes in Equity

 
Preferred
Stock
 
 
Common
Stock
 
 
Additional
Paid In Capital
 
 
Accumulated
Deficit
 
 
Other
Comprehensive
Income/(loss)
 
 
AXT, Inc.
stockholders'
equity
 
 
Noncontrolling
interests
 
 
Total
stockholders'
equity
 
Balance as of December 31, 2012
 
$
3,532
 
 
$
32
 
 
$
193,063
 
 
$
(59,047
)
 
$
6,033
 
 
$
143,613
 
 
$
7,301
 
 
$
150,914
 
Common stock options exercised
 
 
 
 
 
 
 
 
 
 
256
 
 
 
 
 
 
 
 
 
 
 
256
 
 
 
 
 
 
 
256
 
Stock-based compensation
 
 
 
 
 
 
 
 
 
 
332
 
 
 
 
 
 
 
 
 
 
 
332
 
 
 
 
 
 
 
332
 
Net loss
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(2,400
)
 
 
 
 
 
 
(2,400
)
 
 
441
 
 
 
(1,959
)
Dividends declared by joint ventures
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(2,897
)
 
 
(2,897
)
Change in unrealized (loss) gain on marketable securities
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
(17
)
 
 
(17
)
 
 
 
 
 
 
(17
)
Currency translation adjustment
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
350
 
 
 
350
 
 
 
57
 
 
 
407
 
Balance as of March 31, 2013
 
$
3,532
 
 
$
32
 
 
$
193,651
 
 
$
(61,447
)
 
$
6,366
 
 
$
142,134
 
 
$
4,902
 
 
$
147,036
 
 
        There were no reclassification adjustments from accumulated other comprehensive income for the three months ended March 31, 2013 and March 31, 2012.