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CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
CONSOLIDATED STATEMENTS OF OPERATIONS      
Revenue $ 98,673 $ 81,349 $ 77,502
Cost of revenue 64,198 54,968 60,673
Gross profit 34,475 26,381 16,829
Operating expenses:      
Selling, general and administrative 17,009 13,880 16,064
Research and development 4,827 5,850 5,664
Restructuring charge   226  
Total operating expenses 21,836 19,956 21,728
Income (loss) from operations 12,639 6,425 (4,899)
Interest income, net 461 409 412
Equity in (loss) earnings of unconsolidated joint ventures (1,694) (1,995) 462
Other (expense) income, net (553) 860 2,023
Income (loss) before provision for income taxes 10,853 5,699 (2,002)
Provision for income taxes 792 733 531
Net income (loss) 10,061 4,966 (2,533)
Less: Net loss attributable to noncontrolling interests 87 670 305
Net income (loss) attributable to AXT, Inc. $ 10,148 $ 5,636 $ (2,228)
Net income (loss) attributable to AXT, Inc. per common share:      
Basic (in dollars per share) $ 0.27 $ 0.17 $ (0.07)
Diluted (in dollars per share) $ 0.26 $ 0.17 $ (0.07)
Weighted average number of common shares outstanding:      
Basic (in shares) 37,444 32,139 32,183
Diluted (in shares) 38,966 32,894 32,183