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Summary of Significant Accounting Policies - Reconciliation of Changes in Deferred Revenue (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Apr. 04, 2015
Mar. 29, 2014
Reconciliation of the changes in the Company's deferred revenue balance    
Balance, beginning of period $ 1,179us-gaap_DeferredRevenueCurrent [1] $ 1,133us-gaap_DeferredRevenueCurrent
Additions to deferral 323us-gaap_DeferredRevenueAdditions 337us-gaap_DeferredRevenueAdditions
Revenue recognized (305)us-gaap_DeferredRevenueRevenueRecognized (386)us-gaap_DeferredRevenueRevenueRecognized
Balance, end of period $ 1,197us-gaap_DeferredRevenueCurrent $ 1,084us-gaap_DeferredRevenueCurrent
[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 3, 2015.