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Summary of Significant Accounting Policies - Reconciliation of Changes in Warranty Liability (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Reconciliation of the changes in the Company's warranty liability    
Balance, beginning of period $ 468us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 453us-gaap_ProductWarrantyAccrualClassifiedCurrent
Accruals for product warranties 313us-gaap_StandardProductWarrantyAccrualWarrantiesIssued 213us-gaap_StandardProductWarrantyAccrualWarrantiesIssued
Cost of warranty claims (312)us-gaap_StandardProductWarrantyAccrualPayments (198)us-gaap_StandardProductWarrantyAccrualPayments
Balance, end of period $ 469us-gaap_ProductWarrantyAccrualClassifiedCurrent $ 468us-gaap_ProductWarrantyAccrualClassifiedCurrent