CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME
Net income	$ 4,496	$ 1,481	$ 12,876	$ 2,657
Other comprehensive income, net of tax:
Change in foreign currency translation gain, net of tax	70	4,699	1,639	3,086
Change in unrealized gain (loss) on available-for-sale debt investments, net of tax	(9)	(10)	(11)	11
Total other comprehensive income, net of tax	61	4,689	1,628	3,097
Comprehensive income	4,557	6,170	14,504	5,754
Less: Comprehensive income attributable to noncontrolling interests and redeemable noncontrolling interests	(707)	(806)	(1,520)	(1,710)
Comprehensive income attributable to AXT, Inc.	$ 3,850	$ 5,364	$ 12,984	$ 4,044