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Accounting for Stock-Based Compensation (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Stock-based compensation in the form of employee stock options, included in:        
Total stock-based compensation $ 292,000 $ 215,000 $ 573,000 $ 422,000
Tax effect on stock-based compensation 0 0 0 0
Net effect on net income 292,000 215,000 573,000 422,000
Effect on net income attributable to AXT, Inc. per common share:        
Basic (in dollars per share) $ 0.01 $ 0.01 $ 0.02 $ 0.01
Diluted (in dollars per share) $ 0.01 $ 0.01 $ 0.02 $ 0.01
Compensation costs related to unvested stock options not yet recognized 1,800,000   1,800,000  
Value of estimated forfeitures 111,000   111,000  
Weighted-average period of amortization     2 years 4 months 24 days  
Stock options granted during the period (in shares) 24,000 0 104,000 0
Weighted-average assumptions [Abstract]        
Expected term 4 years   4 years  
Volatility (in hundredths) 74.82%   73.74%  
Expected dividend (in hundredths) 0.00%   0.00%  
Risk-free interest rate (in hundredths) 0.56%   0.71%  
Shares [Abstract]        
Options outstanding, beginning of period (in shares)     2,380,000  
Granted (in shares) 24,000 0 104,000 0
Exercised (in shares) 0 (99,000) (100,000) (199,000)
Canceled and expired (in shares)     (30,000)  
Options outstanding, end of period (in shares) 2,354,000   2,354,000  
Options vested and expected to vest, end of period (in shares) 2,309,000   2,309,000  
Options exercisable, end of period (in shares) 1,446,000   1,446,000  
Weighted-average Exercise Price [Roll Forward]        
Options outstanding, beginning of period (in dollars per share)     $ 3.25  
Granted (in dollars per share)     $ 5.22  
Exercised (in dollars per share)     $ 2.19  
Canceled and expired (in dollars per share)     $ 9.69  
Options outstanding, end of period (in dollars per share) $ 3.30   $ 3.30  
Options vested and expected to vest, end of period (in dollars per share) $ 3.27   $ 3.27  
Options exercisable, end of period (in dollars per share) $ 2.65   $ 2.65  
Weighted-average Remaining Contractual Life [Abstract]        
Options outstanding, beginning of period     6 years 3 months  
Options outstanding, end of period     6 years 3 months  
Options vested and expected to vest, end of period     6 years 2 months 4 days  
Options exercisable, end of period     4 years 9 months 10 days  
Aggregate Intrinsic Value [Abstract]        
Options outstanding, beginning of period     3,456,000  
Options outstanding, end of period 2,960,000   2,960,000  
Options vested and expected to vest, end of period 2,947,000   2,947,000  
Options exercisable, end of period 2,465,000   2,465,000  
Closing price (in dollars per share) $ 3.95   $ 3.95  
In-the-money options exercisable (in shares) 1,122,263   1,122,263  
Options Outstanding        
Range of exercise price, minimum (in dollars per share)     $ 1.18  
Range of exercise price, maximum (in dollars per share)     $ 7.82  
Options outstanding, shares (in shares) 2,353,695   2,353,695  
Weighted-average Exercise Price (in dollars per share) $ 3.30   $ 3.30  
Weighted-average Remaining Contractual Life     6 years 2 months 22 days  
Options Exercisable        
Options exercisable, shares (in shares) 1,445,663   1,445,663  
Weighted-average Exercise Price (in dollars per share) $ 2.65   $ 2.65  
Options exercised during the period (in shares) 0 99,000 100,000 199,000
Intrinsic value of options exercised 0 612,000,000 365,000 1,200,000
Proceeds from common stock options exercised     219,000 533,000
Weighted-Average Grant Date Fair Value [Roll Forward]        
Weighted average period for recognizing costs     2 years 4 months 24 days  
Restricted stock [Member]
        
Effect on net income attributable to AXT, Inc. per common share:        
Weighted-average period of amortization 2 years 7 months 6 days   2 years 7 months 6 days  
Shares [Roll Forward]        
Non-vested, beginning of period (in shares)     223,127  
Granted (in shares)     30,768  
Vested (in shares)     (54,825)  
Non-vested, end of period (in shares) 199,070   199,070  
Weighted-Average Grant Date Fair Value [Roll Forward]        
Non-vested, beginning of period (in dollars per share)     $ 4.47  
Granted (in dollars per share)     $ 3.90  
Vested (in dollars per share)     $ 1.92  
Non-vested, end of period (in dollars per share) $ 5.08   $ 5.08  
Unrecognized compensation expense related to restricted stock awards 807,000   807,000  
Weighted average period for recognizing costs 2 years 7 months 6 days   2 years 7 months 6 days  
$1.18 - $1.38 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 407,001   407,001  
Weighted-average Exercise Price (in dollars per share) $ 1.31   $ 1.31  
Weighted-average Remaining Contractual Life     1 year 11 months 26 days  
Options Exercisable        
Options exercisable, shares (in shares) 407,001   407,001  
Weighted-average Exercise Price (in dollars per share) $ 1.31   $ 1.31  
$1.40 - $1.40 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 1,094   1,094  
Weighted-average Exercise Price (in dollars per share) $ 1.40   $ 1.40  
Weighted-average Remaining Contractual Life     2 years 8 months 12 days  
Options Exercisable        
Options exercisable, shares (in shares) 1,094   1,094  
Weighted-average Exercise Price (in dollars per share) $ 1.40   $ 1.40  
$1.59 - $1.59 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 328,460   328,460  
Weighted-average Exercise Price (in dollars per share) $ 1.59   $ 1.59  
Weighted-average Remaining Contractual Life     6 years 9 months 14 days  
Options Exercisable        
Options exercisable, shares (in shares) 247,284   247,284  
Weighted-average Exercise Price (in dollars per share) $ 1.59   $ 1.59  
$1.88 - $1.91 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 8,000   8,000  
Weighted-average Exercise Price (in dollars per share) $ 1.90   $ 1.90  
Weighted-average Remaining Contractual Life     2 years 3 months  
Options Exercisable        
Options exercisable, shares (in shares) 8,000   8,000  
Weighted-average Exercise Price (in dollars per share) $ 1.90   $ 1.90  
$2.04 - $2.04 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 441,775   441,775  
Weighted-average Exercise Price (in dollars per share) $ 2.04   $ 2.04  
Weighted-average Remaining Contractual Life     7 years 3 months 25 days  
Options Exercisable        
Options exercisable, shares (in shares) 283,874   283,874  
Weighted-average Exercise Price (in dollars per share) $ 2.04   $ 2.04  
$2.19 - $4.09 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 201,510   201,510  
Weighted-average Exercise Price (in dollars per share) $ 2.72   $ 2.72  
Weighted-average Remaining Contractual Life     2 years 3 days  
Options Exercisable        
Options exercisable, shares (in shares) 177,510   177,510  
Weighted-average Exercise Price (in dollars per share) $ 2.56   $ 2.56  
$4.79 - $4.79 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 366,500   366,500  
Weighted-average Exercise Price (in dollars per share) $ 4.79   $ 4.79  
Weighted-average Remaining Contractual Life     9 years 3 months 28 days  
Options Exercisable        
Options exercisable, shares (in shares) 0   0  
Weighted-average Exercise Price (in dollars per share) $ 0.00   $ 0.00  
$4.81 - $5.61 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 144,610   144,610  
Weighted-average Exercise Price (in dollars per share) $ 5.26   $ 5.26  
Weighted-average Remaining Contractual Life     7 years 4 months 9 days  
Options Exercisable        
Options exercisable, shares (in shares) 64,610   64,610  
Weighted-average Exercise Price (in dollars per share) $ 4.84   $ 4.84  
$5.83 - $5.83 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 362,450   362,450  
Weighted-average Exercise Price (in dollars per share) $ 5.83   $ 5.83  
Weighted-average Remaining Contractual Life     8 years 1 month 2 days  
Options Exercisable        
Options exercisable, shares (in shares) 176,380   176,380  
Weighted-average Exercise Price (in dollars per share) $ 5.83   $ 5.83  
$6.31 - $7.82 [Member]
        
Options Outstanding        
Options outstanding, shares (in shares) 92,295   92,295  
Weighted-average Exercise Price (in dollars per share) $ 6.65   $ 6.65  
Weighted-average Remaining Contractual Life     5 years 11 months 22 days  
Options Exercisable        
Options exercisable, shares (in shares) 79,910   79,910  
Weighted-average Exercise Price (in dollars per share) $ 6.46   $ 6.46  
Cost of revenue [Member]
        
Stock-based compensation in the form of employee stock options, included in:        
Total stock-based compensation 19,000 20,000 37,000 40,000
Selling, general and administrative [Member]
        
Stock-based compensation in the form of employee stock options, included in:        
Total stock-based compensation 238,000 183,000 476,000 359,000
Research and development [Member]
        
Stock-based compensation in the form of employee stock options, included in:        
Total stock-based compensation $ 35,000 $ 12,000 $ 60,000 $ 23,000