Inventories (Details) - USD ($) $ in Thousands	Jul. 04, 2015	Jan. 03, 2015
Inventory Disclosure [Abstract]
Raw materials	$ 3,686	$ 3,966
Work in process	2,099	1,609
Finished goods	4,386	3,544
Total inventories	$ 10,171	$ 9,119	[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 January 3, 2015.