Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 01, 2016		Oct. 03, 2015
Reconciliation of the changes in the Company's deferred revenue balance
Balance, beginning of period	$ 1,311	[1]	$ 1,179
Additions to deferral	1,025		1,068
Revenue recognized	(1,031)		(1,036)
Balance, end of period	$ 1,305		$ 1,211

[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.