Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 04, 2020	Jun. 29, 2019	Jul. 04, 2020	Jun. 29, 2019
Condensed Consolidated Statements of Operations
Revenues	$ 207,533	$ 206,709	$ 422,410	$ 394,822
Costs of revenues	81,222	79,660	166,933	151,899
Gross profit	126,311	127,049	255,477	242,923
Operating expenses:
Research and development	70,838	63,856	142,061	125,422
Selling, general and administrative	48,404	48,637	102,400	97,853
Operating expenses	119,242	112,493	244,461	223,275
Operating income	7,069	14,556	11,016	19,648
Other income (expense):
Interest income and other, net	3,267	3,696	6,518	6,519
Interest expense	(11,778)	(5,005)	(17,319)	(10,002)
Income (loss) before income taxes	(1,442)	13,247	215	16,165
Provision (benefit) for income taxes	381	29,276	(206)	26,796
Net income (loss)	$ (1,823)	$ (16,029)	$ 421	$ (10,631)
Earnings (loss) per share:
Basic (in dollars per share)	$ (0.04)	$ (0.37)	$ 0.01	$ (0.25)
Diluted (in dollars per share)	$ (0.04)	$ (0.37)	$ 0.01	$ (0.25)
Weighted-average common shares outstanding:
Basic (in shares)	43,761	43,386	43,699	43,287
Diluted (in shares)	43,761	43,386	44,219	43,287