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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 28, 2014
Jun. 29, 2013
Reconciliation of the changes in the Company's deferred revenue balance    
Balance, beginning of period $ 1,133 [1] $ 1,004
Additions to deferral 636 646
Revenue recognized (686) (632)
Balance, end of period $ 1,083 $ 1,018
[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.