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CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CONSOLIDATED STATEMENTS OF OPERATIONS      
Revenue $ 102,397 $ 98,673 $ 81,349
Cost of revenue 65,350 64,198 54,968
Gross profit 37,047 34,475 26,381
Operating expenses:      
Selling, general and administrative 19,003 17,009 13,880
Research and development 5,897 4,827 5,850
Restructuring charge     226
Total operating expenses 24,900 21,836 19,956
Income from operations 12,147 12,639 6,425
Interest income, net 528 461 409
Equity in loss of unconsolidated joint ventures (1,080) (1,694) (1,995)
Other income (expense), net 352 (553) 860
Income before provision for income taxes 11,947 10,853 5,699
Provision for income taxes 938 792 733
Net income 11,009 10,061 4,966
Less: Net loss (income) attributable to noncontrolling interests (1,355) 87 670
Net income attributable to AXT, Inc. $ 9,654 $ 10,148 $ 5,636
Net income attributable to AXT, Inc. per common share:      
Basic (in dollars per share) $ 0.24 $ 0.27 $ 0.17
Diluted (in dollars per share) $ 0.24 $ 0.26 $ 0.17
Weighted-average number of common shares outstanding:      
Basic (in shares) 39,049 37,444 32,139
Diluted (in shares) 40,265 38,966 32,894