CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 95,361	$ 83,256	$ 102,397
Cost of revenue	65,086	58,431	65,350
Gross profit	30,275	24,825	37,047
Operating expenses:
Selling, general and administrative	19,200	19,305	19,003
Research and development	7,135	5,834	5,897
Total operating expenses	26,335	25,139	24,900
Income (loss) from operations	3,940	(314)	12,147
Interest income (expense), net	(179)	217	528
Equity in income (loss) of unconsolidated joint ventures	111	(1,876)	(1,080)
Other income, net	3,200	947	352
Income (loss) before provision for income taxes	7,072	(1,026)	11,947
Provision for income taxes	2,031	562	938
Net income (loss)	5,041	(1,588)	11,009
Less: Net income attributable to noncontrolling interests	(1,803)	(1,012)	(1,355)
Net income (loss) attributable to AXT, Inc.	$ 3,238	$ (2,600)	$ 9,654
Net income (loss) attributable to AXT, Inc. per common share:
Basic	$ 0.08	$ (0.07)	$ 0.24
Diluted	$ 0.07	$ (0.07)	$ 0.24
Weighted-average number of common shares outstanding:
Basic	40,152	39,487	39,049
Diluted	41,025	39,487	40,265