Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 03, 2021	Jul. 04, 2020	Jul. 03, 2021	Jul. 04, 2020
Condensed Consolidated Statements of Operations
Revenues	$ 169,492	$ 114,350	$ 327,349	$ 232,368
Cost of revenues	73,194	47,771	139,297	96,942
Gross profit	96,298	66,579	188,052	135,426
Operating expenses:
Research and development	64,832	57,992	128,847	115,702
Selling, general and administrative	42,953	40,350	85,407	84,802
Operating expenses	107,785	98,342	214,254	200,504
Operating loss	(11,487)	(31,763)	(26,202)	(65,078)
Other income (expense):
Interest income and other, net	647	3,267	3,522	6,518
Interest expense	(6,486)	(11,778)	(17,810)	(17,319)
Loss from continuing operations before income taxes	(17,326)	(40,274)	(40,490)	(75,879)
Provision (benefit) for income taxes	1,165	(4,229)	3,157	(8,443)
Loss from continuing operations	(18,491)	(36,045)	(43,647)	(67,436)
Income from discontinued operations, net of income taxes	38,423	34,222	77,088	67,857
Net income (loss)	$ 19,932	$ (1,823)	$ 33,441	$ 421
Basic earnings (loss) per share:
Continuing operations (in dollars per share)	$ (0.41)	$ (0.82)	$ (0.98)	$ (1.54)
Net income (in dollars per share)	0.44	(0.04)	0.75	0.01
Diluted earnings (loss) per share:
Continuing operations (in dollars per share)	(0.41)	(0.82)	(0.98)	(1.54)
Net income (in dollars per share)	$ 0.44	$ (0.04)	$ 0.73	$ 0.01
Weighted-average common shares outstanding:
Basic (in shares)	44,803	43,761	44,481	43,699
Diluted (in shares)	45,756	43,761	45,794	44,219