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Net Income Per Share (Details) (USD $)
 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Jun. 30, 2012
Options [Member]
Jun. 30, 2011
Options [Member]
Jun. 30, 2012
Options [Member]
Jun. 30, 2011
Options [Member]
Jun. 30, 2012
Restricted stock [Member]
Jun. 30, 2011
Restricted stock [Member]
Jun. 30, 2012
Restricted stock [Member]
Jun. 30, 2011
Restricted stock [Member]
Jun. 30, 2012
Series A preferred stock [Member]
Jun. 30, 2012
Series A preferred stock [Member]
Dec. 31, 2011
Series A preferred stock [Member]
Jun. 30, 2012
Restricted stock [Member]
Jun. 30, 2011
Restricted stock [Member]
Jun. 30, 2012
Restricted stock [Member]
Jun. 30, 2011
Restricted stock [Member]
Jun. 30, 2012
Common stock options [Member]
Jun. 30, 2011
Common stock options [Member]
Jun. 30, 2012
Common stock options [Member]
Jun. 30, 2011
Common stock options [Member]
Numerator:                                                
Net income attributable to AXT, Inc. $ 1,299,000 $ 7,062,000 $ 2,934,000 $ 11,270,000                                        
Less: Preferred stock dividends (44,000) (44,000) (88,000) (88,000)                                        
Net income available to common stockholders 1,255,000 7,018,000 2,846,000 11,182,000                                        
Denominator:                                                
Denominator for basic net income per share - weighted average common shares (in shares) 32,138,000 31,831,000 32,086,000 31,775,000                                        
Effect of Dilutive Securities on Earnings Per Share [Line Items]                                                
Effect of dilutive securities (in shares)                                 32,000 103,000 57,000 130,000 774,000 1,159,000 838,000 1,241,000
Denominator for dilutive net income per common share (in shares) 32,944,000 33,093,000 32,981,000 33,146,000                                        
Net income attributable to AXT, Inc. per common share:                                                
Basic (in dollars per share) $ 0.04 $ 0.22 $ 0.09 $ 0.35                                        
Diluted (in dollars per share) $ 0.04 $ 0.21 $ 0.09 $ 0.34                                        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]                                                
Securities excluded from diluted net income per share as the impact is anti-dilutive (in shares)           997,000 418,000 907,000 406,000 14,000 186,000 15,000 186,000                      
Class of Stock [Line Items]                                                
Preferred stock, shares issued (in shares) 883,000   883,000   883,000                 883,000 883,000 883,000                
Preferred stock, shares outstanding (in shares) 883,000   883,000   883,000                 883,000 883,000 883,000                
Preferred stock, par value (in dollars per share) $ 0.001   $ 0.001   $ 0.001                 $ 0.001 $ 0.001 $ 0.001                
Preferred stock, value $ 3,532,000   $ 3,532,000   $ 3,532,000 [1]                 $ 3,532,000 $ 3,532,000 $ 3,532,000                
Cumulative annual dividend rate (in hundredths)                           5.00% 5.00% 5.00%                
Liquidation preference over common stock (in dollars per share)                           $ 4 $ 4 $ 4                
[1] The Condensed Consolidated Balance Sheet at December 31, 2011 has been derived from the audited consolidated financial statements at that date.