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Stock-Based Compensation (Details) (USD $)	3 Months Ended		6 Months Ended		3 Months Ended	6 Months Ended		12 Months Ended		6 Months Ended	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2012 Stock Options [Member]	Jun. 30, 2013 Stock Options [Member]	Jun. 30, 2012 Stock Options [Member]	Dec. 31, 2012 Stock Options [Member]	Jun. 28, 2013 Stock Options [Member]	Jun. 30, 2013 Restricted Stock [Member]	Jun. 30, 2013 Cost of revenue [Member]	Jun. 30, 2012 Cost of revenue [Member]	Jun. 30, 2013 Cost of revenue [Member]	Jun. 30, 2012 Cost of revenue [Member]	Jun. 30, 2013 Selling, general and administrative [Member]	Jun. 30, 2012 Selling, general and administrative [Member]	Jun. 30, 2013 Selling, general and administrative [Member]	Jun. 30, 2012 Selling, general and administrative [Member]	Jun. 30, 2013 Research and development [Member]	Jun. 30, 2012 Research and development [Member]	Jun. 30, 2013 Research and development [Member]	Jun. 30, 2012 Research and development [Member]
Stock-based compensation in the form of employee stock options and restricted stock [Abstract]
Total stock-based compensation	$ 338,000	$ 292,000	$ 670,000	$ 573,000							$ 5,000	$ 19,000	$ 11,000	$ 37,000	$ 291,000	$ 238,000	$ 575,000	$ 476,000	$ 42,000	$ 35,000	$ 84,000	$ 60,000
Tax effect on stock-based compensation	0	0	0	0
Net effect on net income (loss)	338,000	292,000	670,000	573,000
Effect on net income (loss) attributable to AXT, Inc. per common share [Abstract]
Basic (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.02)
Diluted (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.02)	$ (0.02)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation costs related to unvested stock options not yet recognized						1,700,000
Value of estimated forfeitures						26,000
Weighted-average period of amortization						2 years 4 months 24 days				2 years 2 months 12 days
Weighted-average grant date fair value of stock options granted (in dollars per share)	$ 0	$ 2.15	$ 0	$ 2.84
Weighted average assumptions [Abstract]
Expected term (in years)	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%
Number of options outstanding [Roll Forward]
Options outstanding, beginning of period (in shares)						2,727,000
Granted (in shares)					24,000,000	0	104,000,000
Exercised (in shares)						(195,000)
Canceled and expired (in shares)						(38,000)
Options outstanding, end of period (in shares)						2,494,000		2,727,000
Options vested and expected to vest as of June 30, 2013 (in shares)						2,481,000
Options exercisable as of June 30, 2013 (in shares)						1,600,000
Weighted average exercise price [Roll Forward]
Options outstanding, beginning of period (in dollars per share)						$ 3.28
Granted (in dollars per share)						$ 0
Exercised (in dollars per share)						$ 1.40
Canceled and expired (in dollars per share)						$ 4.30
Options outstanding, end of period (in dollars per share)						$ 3.41		$ 3.28
Options vested and expected to vest as of June 30, 2013 (in dollars per share)						$ 3.41
Options exercisable as of June 30, 2013 (in dollars per share)						$ 3.18
Weighted average Remaining Contractual Life [Abstract]
Options outstanding, beginning of period						6 years 7 months 20 days		6 years 8 months 16 days
Options outstanding, end of period						6 years 7 months 20 days		6 years 8 months 16 days
Options vested and expected to vest, end of period						6 years 7 months 17 days
Option exercisable, end of period						5 years 6 months 4 days
Aggregate Intrinsic Value [Abstract]
Options outstanding, beginning of period						1,353,000
Options outstanding, end of period						969,000		1,353,000
Options vested and expected to vest, aggregate intrinsic value						969,000
Options exercisable, end of period						938,000
Closing price (in dollars per share)									$ 2.70
Shares [Roll Forward]
Non-vested, beginning of period (in shares)										238,723
Granted (in shares)										43,636
Vested (in shares)										(24,781)
Non-vested, end of period (in shares)										257,578
Weighted Average Grant Date Fair Value [Roll Forward]
Non-vested, beginning of period (in dollars per share)										$ 4.27
Granted (in dollars per share)										$ 2.75
Vested (in dollars per share)										$ 4.44
Non-vested, end of period (in dollars per share)										$ 4.00
Unrecognized compensation expense related to restricted stock awards										$ 789,000

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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