Goodwill and Intangible Assets - Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 30, 2019	Dec. 29, 2018
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	$ 45,435	$ 45,385
Accumulated amortization	(18,863)	(18,059)
Net carrying amount	26,572	27,326
Developed technology [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	35,997	35,954
Accumulated amortization	(17,040)	(16,532)
Net carrying amount	18,957	19,422
Customer relationships [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	6,538	6,531
Accumulated amortization	(1,790)	(1,519)
Net carrying amount	4,748	5,012
In-process research and development [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	1,400	1,400
Net carrying amount	1,400	1,400
Trade name [Member]
Summary of intangible assets, net (excluding goodwill)
Adjusted cost	1,500	1,500
Accumulated amortization	(33)	(8)
Net carrying amount	$ 1,467	$ 1,492