Condensed Consolidated Statements of Income - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 03, 2020	Sep. 28, 2019	Oct. 03, 2020	Sep. 28, 2019
Condensed Consolidated Statements of Income
Revenues	$ 221,350	$ 223,294	$ 643,760	$ 618,116
Costs of revenues	91,276	89,204	258,209	241,103
Gross profit	130,074	134,090	385,551	377,013
Operating expenses:
Research and development	71,969	62,552	214,030	187,974
Selling, general and administrative	48,483	47,718	150,883	145,571
Operating expenses	120,452	110,270	364,913	333,545
Operating income	9,622	23,820	20,638	43,468
Other income (expense):
Interest income and other, net	2,044	3,172	8,562	9,691
Interest expense	(8,604)	(5,126)	(25,923)	(15,128)
Income before income taxes	3,062	21,866	3,277	38,031
Provision (benefit) for income taxes	(100)	1,685	(306)	28,481
Net income	$ 3,162	$ 20,181	$ 3,583	$ 9,550
Net income
Basic (in dollars per share)	$ 0.07	$ 0.47	$ 0.08	$ 0.22
Diluted (in dollars per share)	$ 0.07	$ 0.45	$ 0.08	$ 0.22
Weighted-average common shares outstanding:
Basic (in shares)	43,815	43,358	43,737	43,311
Diluted (in shares)	44,328	44,634	44,254	44,120