Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
Mar. 27, 2021	Mar. 28, 2020
Income Statement [Abstract]
Revenues	$ 186,636	$ 160,753
Cost of revenues	109,930	93,363
Gross profit	76,706	67,390
Operating expenses:
Research and development	24,046	21,267
Selling, general and administrative	30,015	27,693
Total operating expenses	54,061	48,960
Operating income	22,645	18,430
Interest income	194	685
Interest expense	(180)	(318)
Other income (expense), net	172	(91)
Income before income taxes	22,831	18,706
Provision for income taxes	3,206	2,816
Net income	$ 19,625	$ 15,890
Net income per share:
Basic (In dollars per share)	$ 0.25	$ 0.21
Diluted (In dollars per share)	$ 0.25	$ 0.20
Weighted-average number of shares used in per share calculations:
Basic (in shares)	77,598	76,005
Diluted (in shares)	79,988	78,510

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=120395209&loc=SL114868664-224227