Inventories - Components of Inventories (Details) - USD ($) $ in Thousands	Mar. 28, 2020	Dec. 28, 2019
Inventory Disclosure [Abstract]
Raw materials	$ 2,600	$ 2,043
Work in process	747	1,111
Finished goods	4,811	5,020
Total inventories	$ 8,158	$ 8,174	[1]

[1] Derived from the audited consolidated financial statements included in the Annual Report on Form 10-K filed with the SEC for the year ended December 28, 2019.