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Fair Value of Financial Instruments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Short-term marketable securities $ 9,624 $ 4,982
Unrealized gain (loss) 100 (100)
Fair Value    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Short-term marketable securities 9,624 4,982
Foreign currency forward exchange contracts, net 53 77
Total fair value of financial instruments 9,677 5,059
Fair Value | Level 1    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Short-term marketable securities 9,624 4,982
Foreign currency forward exchange contracts, net 0 0
Total fair value of financial instruments 9,624 4,982
Fair Value | Level 2    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Short-term marketable securities 0 0
Foreign currency forward exchange contracts, net 53 77
Total fair value of financial instruments 53 77
Fair Value | Level 3    
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]    
Short-term marketable securities 0 0
Foreign currency forward exchange contracts, net 0 0
Total fair value of financial instruments $ 0 $ 0