CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
CONSOLIDATED STATEMENTS OF OPERATIONS
Revenue	$ 83,256	$ 102,397	$ 98,673
Cost of revenue	58,431	65,350	64,198
Gross profit	24,825	37,047	34,475
Operating expenses:
Selling, general and administrative	19,305	19,003	17,009
Research and development	5,834	5,897	4,827
Total operating expenses	25,139	24,900	21,836
Income (loss) from operations	(314)	12,147	12,639
Interest income, net	217	528	461
Equity in loss of unconsolidated joint ventures	(1,876)	(1,080)	(1,694)
Other income (expense), net	947	352	(553)
Income (loss) before provision for income taxes	(1,026)	11,947	10,853
Provision for income taxes	562	938	792
Net income (loss)	(1,588)	11,009	10,061
Less: Net (income) loss attributable to noncontrolling interests	(1,012)	(1,355)	87
Net income (loss) attributable to AXT, Inc.	$ (2,600)	$ 9,654	$ 10,148
Net income (loss) attributable to AXT, Inc. per common share:
Basic	$ (0.07)	$ 0.24	$ 0.27
Diluted	$ (0.07)	$ 0.24	$ 0.26
Weighted-average number of common shares outstanding:
Basic	39,487	39,049	37,444
Diluted	39,487	40,265	38,966