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Cash and Cash Equivalents (Tables)
 9 Months Ended
Sep. 29, 2018
Cash and Cash Equivalents [Abstract]  
Summary of cash and cash equivalents
Cash and cash equivalents consisted of the following (in thousands):
 
 
September 29,
2018
 
December 31,
2017
Cash and cash equivalents:
 
 
 
 
Cash
 
$
49,213

 
$
35,999

Money market funds
 
3,820

 
3,776


 
$
53,033

 
$
39,775