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Condensed Consolidated Statements of Operations (Unaudited) - USD ($)
shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Revenue $ 129,150 $ 100,362 [1]
Cost of revenue 57,655 45,520
Gross profit 71,495 54,842
Operating expenses:    
Research and development 21,609 18,894
Selling, general and administrative 27,318 22,092
Litigation expense 531 286
Total operating expenses 49,458 41,272
Income from operations 22,037 13,570
Interest and other income, net 440 1,381
Income before income taxes 22,477 14,951
Income tax provision 621 474
Net income $ 21,856 $ 14,477
Net income per share:    
Basic (in dollars per share) $ 0.52 $ 0.35
Diluted (in dollars per share) $ 0.49 $ 0.33
Weighted-average shares outstanding:    
Basic (in shares) 41,922 41,047
Diluted (in shares) 44,282 43,268
Cash dividends declared per common share (in dollars per share) $ 0.30 $ 0.20
[1] 2017 amounts have not been retrospectively adjusted under the modified retrospective method.