Fair Value of Financial Instruments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 30, 2019	Mar. 31, 2018	Dec. 29, 2018
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Short-term marketable securities	$ 0		$ 9,624
Foreign currency forward exchange contracts, net	84		53
Total fair value of financial instruments	84		9,677
Unrealized gain (loss) on marketable securities	100	$ (100)
Level 1
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Short-term marketable securities	0		9,624
Foreign currency forward exchange contracts, net	0		0
Total fair value of financial instruments	0		9,624
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	84		53
Total fair value of financial instruments	84		53
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