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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Oct. 02, 2021
Sep. 26, 2020
Oct. 02, 2021
Sep. 26, 2020
Revenue:        
Revenue $ 172,231 $ 150,508 $ 502,975 $ 371,213
Cost of revenue:        
Cost of revenue 82,738 74,533 237,621 193,209
Gross profit 89,493 75,975 265,354 178,004
Operating expenses:        
Sales and marketing 31,144 23,079 88,905 65,046
Research and development 25,727 20,378 75,807 61,970
General and administrative 14,631 10,768 41,320 32,630
Restructuring charges 0 0 0 6,286
Total operating expenses 71,502 54,225 206,032 165,932
Income from operations 17,991 21,750 59,322 12,072
Interest and other expense, net:        
Interest expense, net (86) (356) (330) (1,263)
Other expense, net (463) (707) (120) (801)
Total interest and other expense, net (549) (1,063) (450) (2,064)
Income before income taxes 17,442 20,687 58,872 10,008
Income taxes (159,982) 149 (159,625) 626
Net income $ 177,424 $ 20,538 $ 218,497 $ 9,382
Net income per common share:        
Basic (in dollars per share) $ 2.79 $ 0.34 $ 3.47 $ 0.16
Diluted (in dollars per share) $ 2.61 $ 0.32 $ 3.24 $ 0.16
Weighted-average number of shares used to compute net income (loss) per common share        
Basic (in shares) 63,588 60,307 63,057 58,053
Diluted (in shares) 67,907 63,449 67,537 60,331
Net income        
Other comprehensive income (loss), net of tax - foreign currency translation adjustment, net $ (24) $ 410 $ (15) $ 161
Comprehensive income 177,400 20,948 218,482 9,543
Systems        
Revenue:        
Revenue 163,076 142,294 475,931 347,644
Cost of revenue:        
Cost of revenue 76,339 68,889 218,675 176,318
Services        
Revenue:        
Revenue 9,155 8,214 27,044 23,569
Cost of revenue:        
Cost of revenue $ 6,399 $ 5,644 $ 18,946 $ 16,891