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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) - USD ($)
$ in Thousands
3 Months Ended
Apr. 02, 2016
Apr. 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 336 323
Revenue recognized (336) (305)
Balance, end of period $ 1,311 $ 1,197
[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.