Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended
Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Income Statement [Abstract]
Revenues	$ 188,076	$ 157,824	$ 374,712	$ 318,577
Cost of revenues	111,793	91,657	221,723	185,020
Gross profit	76,283	66,167	152,989	133,557
Operating expenses:
Research and development	25,454	20,919	49,500	42,186
Selling, general and administrative	30,479	22,755	60,494	50,448
Total operating expenses	55,933	43,674	109,994	92,634
Operating income	20,350	22,493	42,995	40,923
Interest income	148	376	342	1,061
Interest expense	(116)	(171)	(296)	(489)
Other expense, net	(194)	(67)	(22)	(158)
Income before income taxes	20,188	22,631	43,019	41,337
Provision for income taxes	2,283	2,162	5,489	4,978
Net income	$ 17,905	$ 20,469	$ 37,530	$ 36,359
Net income per share:
Basic (in dollars per share)	$ 0.23	$ 0.27	$ 0.48	$ 0.48
Diluted (in dollars per share)	$ 0.23	$ 0.26	$ 0.47	$ 0.46
Weighted-average number of shares used in per share calculations:
Basic (in shares)	77,463	76,275	77,530	76,140
Diluted (in shares)	79,466	78,861	79,621	78,710

The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 924
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 11.L)
-URI http://asc.fasb.org/extlink&oid=6472922&loc=d3e499488-122856

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 220
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.2(a),(d))
-URI http://asc.fasb.org/extlink&oid=123367319&loc=SL114868664-224227