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Fair Value of Financial Instruments (Tables)
6 Months Ended
Jun. 30, 2018
Fair Value Disclosures [Abstract]  
Schedule of Fair Value of Financial Instruments
 
Fair value measurements as of
 
Fair value measurements as of
 
June 30, 2018
 
December 30, 2017
(In thousands)
Total
 
Level 1
 
Level 2
 
Level 3
 
Total
 
Level 1
 
Level 2
 
Level 3
Short-term marketable securities
$
12,086

 
$
12,086

 
$

 
$

 
$
4,982

 
$
4,982

 
$

 
$

Foreign currency forward exchange contracts, net
36

 

 
36

 

 
77

 

 
77

 

Total fair value of financial instruments
$
12,122

 
$
12,086

 
$
36

 
$

 
$
5,059

 
$
4,982

 
$
77

 
$