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CONDENSED CONSOLIDATED STATEMENTS OF INCOME - USD ($)
shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jul. 01, 2023
Jun. 25, 2022
Jul. 01, 2023
Jun. 25, 2022
Income Statement [Abstract]        
Revenues $ 155,916 $ 203,907 $ 323,364 $ 401,081
Cost of revenues 95,633 109,538 202,003 212,488
Gross profit 60,283 94,369 121,361 188,593
Operating expenses:        
Research and development 28,340 28,317 56,585 55,451
Selling, general and administrative 33,255 33,406 65,997 66,312
Total operating expenses 61,595 61,723 122,582 121,763
Operating income (loss) (1,312) 32,646 (1,221) 66,830
Interest income, net 1,482 181 2,758 127
Other income, net 450 551 473 743
Income before income taxes 620 33,378 2,010 67,700
Provision (benefit) for income taxes (208) 3,136 (160) 7,586
Net income $ 828 $ 30,242 $ 2,170 $ 60,114
Net income per share:        
Basic (in dollars per share) $ 0.01 $ 0.39 $ 0.03 $ 0.77
Diluted (in dollars per share) $ 0.01 $ 0.38 $ 0.03 $ 0.76
Weighted-average number of shares used in per share calculations:        
Basic (in shares) 77,159 77,897 77,112 78,071
Diluted (in shares) 77,616 79,210 77,450 79,423