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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
9 Months Ended
Sep. 27, 2014
Sep. 28, 2013
Reconciliation of the changes in the Company's deferred revenue balance    
Balance, beginning of period $ 1,133 [1] $ 1,004
Additions to deferral 1,095 985
Revenue recognized (1,053) (927)
Balance, end of period $ 1,175 $ 1,062
[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, 2013.