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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
CONSOLIDATED STATEMENTS OF OPERATIONS      
Revenue $ 137,393 $ 95,361 $ 83,256
Cost of revenue 89,979 65,086 58,431
Gross profit 47,414 30,275 24,825
Operating expenses:      
Selling, general and administrative 24,189 19,200 19,305
Research and development 10,328 7,135 5,834
Total operating expenses 34,517 26,335 25,139
Income (loss) from operations 12,897 3,940 (314)
Interest income (expense), net (213) (179) 217
Equity in income (loss) of unconsolidated joint ventures 4,409 111 (1,876)
Other income, net 509 3,200 947
Income (loss) before provision for income taxes 17,602 7,072 (1,026)
Provision for income taxes 1,093 2,031 562
Net income (loss) 16,509 5,041 (1,588)
Less: Net income attributable to noncontrolling interests and redeemable noncontrolling interests (1,934) (1,803) (1,012)
Net income (loss) attributable to AXT, Inc. $ 14,575 $ 3,238 $ (2,600)
Net income (loss) attributable to AXT, Inc. per common share:      
Basic $ 0.35 $ 0.08 $ (0.07)
Diluted $ 0.34 $ 0.07 $ (0.07)
Weighted-average number of common shares outstanding:      
Basic 41,367 40,152 39,487
Diluted 42,720 41,025 39,487