Acquisition - Summary of Final Purchase Price Allocation (Details) - USD ($) $ in Thousands	Sep. 28, 2019	Dec. 29, 2018	Nov. 15, 2018
Business Acquisition [Line Items]
Goodwill	$ 26,310	$ 26,372
4D Technology Corporation [Member]
Business Acquisition [Line Items]
Cash and cash equivalents			$ 1,414
Accounts receivable, net			4,156
Inventories			4,563
Prepaid and other current assets			104
Property and equipment			145
Accounts payable			(702)
Accrued liabilities			(760)
Deferred revenue			(197)
Deferred tax liabilities			(5,408)
Total assets acquired/liabilities assumed			3,315
Total identified intangible assets			23,500
Total identifiable net assets			26,815
Goodwill			15,700
Total purchase consideration			42,515
4D Technology Corporation [Member] | Developed technology [Member]
Business Acquisition [Line Items]
Total identified intangible assets			15,500
4D Technology Corporation [Member] | In-process research and development [Member]
Business Acquisition [Line Items]
Total identified intangible assets			1,400
4D Technology Corporation [Member] | Customer relationships [Member]
Business Acquisition [Line Items]
Total identified intangible assets			4,600
4D Technology Corporation [Member] | Order backlog [Member]
Business Acquisition [Line Items]
Total identified intangible assets			500
4D Technology Corporation [Member] | Trade name [Member]
Business Acquisition [Line Items]
Total identified intangible assets			$ 1,500