Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	$ 45,492	$ 45,385
Accumulated amortization	(20,414)	(18,059)
Net carrying amount	25,078	27,326
Developed technology [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	36,545	35,954
Accumulated amortization	(18,004)	(16,532)
Net carrying amount	18,541	19,422
Customer relationships [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	6,547	6,531
Accumulated amortization	(2,327)	(1,519)
Net carrying amount	4,220	5,012
In-process research and development [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	900	1,400
Net carrying amount	900	1,400
Trade name [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	1,500	1,500
Accumulated amortization	(83)	(8)
Net carrying amount	$ 1,417	$ 1,492