Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 28, 2020	Mar. 30, 2019
Income Statement [Abstract]
Revenues	$ 160,753	$ 132,213
Cost of revenues	93,363	79,692
Gross profit	67,390	52,521
Operating expenses:
Research and development	21,267	19,723
Selling, general and administrative	27,693	25,184
Total operating expenses	48,960	44,907
Operating income	18,430	7,614
Interest income	685	580
Interest expense	(318)	(595)
Other expense, net	(91)	(84)
Income before income taxes	18,706	7,515
Provision for income taxes	2,816	2,032
Net income	$ 15,890	$ 5,483
Net income per share:
Basic (In dollars per share)	$ 0.21	$ 0.07
Diluted (In dollars per share)	$ 0.20	$ 0.07
Basic
Basic (In shares)	76,005	74,362
Diluted (In shares)	78,510	76,009