Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	6 Months Ended
	Jul. 02, 2016		Jul. 04, 2015
Reconciliation of the changes in the Company's deferred revenue balance
Balance, beginning of period	$ 1,311	[1]	$ 1,179
Additions to deferral	640		687
Revenue recognized	(680)		(667)
Balance, end of period	$ 1,271		$ 1,199

[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 2, 2016.