Condensed Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 28, 2019	Sep. 29, 2018	Sep. 28, 2019	Sep. 29, 2018
Net revenues:
Total net revenues	$ 73,125	$ 76,590	$ 207,845	$ 247,507
Costs of net revenues:
Amortization of intangible assets	449	35	1,385	105
Total costs of net revenues	34,449	32,956	100,209	105,451
Gross profit	38,676	43,634	107,636	142,056
Operating expenses:
Research and development	13,779	12,717	40,864	35,410
Selling	8,465	8,902	25,991	28,077
General and administrative	7,784	7,744	23,574	22,950
Merger expenses	2,424		3,331
Amortization of intangible assets	289		867
Total operating expenses	32,741	29,363	94,627	86,437
Income from operations	5,935	14,271	13,009	55,619
Other income (expense):
Interest expense, net	(38)	(104)	(144)	(245)
Other income, net	257	322	1,355	508
Total other income, net	219	218	1,211	263
Income before income taxes	6,154	14,489	14,220	55,882
Provision for income taxes	1,943	2,921	3,106	10,258
Net income	$ 4,211	$ 11,568	$ 11,114	$ 45,624
Net income per share:
Basic (in dollars per share)	$ 0.17	$ 0.48	$ 0.45	$ 1.90
Diluted (in dollars per share)	$ 0.17	$ 0.47	$ 0.45	$ 1.86
Weighted average shares used in per share calculation:
Basic (in shares)	24,529	24,059	24,631	24,065
Diluted (in shares)	24,783	24,466	24,952	24,551
Products [Member]
Net revenues:
Total net revenues	$ 60,102	$ 63,798	$ 166,498	$ 211,521
Costs of net revenues:
Cost of products and service	26,743	25,589	76,936	85,417
Service [Member]
Net revenues:
Total net revenues	13,023	12,792	41,347	35,986
Costs of net revenues:
Cost of products and service	$ 7,257	$ 7,332	$ 21,888	$ 19,929