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Revenue Recognition
 6 Months Ended
Jun. 27, 2020
Revenue from Contract with Customer [Abstract]  
Revenue Recognition
2 Revenue Recognition
The Company’s deferred revenue liabilities on the consolidated balance sheets consist of the obligation on instrument service contracts and customer payments received in advance, prior to transfer of control of the instrument. The Company records deferred revenue primarily related to its service contracts, where consideration is billable at the beginning of the service period.
The following is a summary of the activity of the Company’s deferred revenue and customer advances for the six months ended June 27, 2020 and June 29, 2019 (in thousands):
 
  
June 27, 2020
 
  
June 29, 2019
 
Balance at the beginning of the period
  $
213,695
    $
204,257
 
Recognition of revenue included in balance at beginning of the period
   
(141,297
 )    
(172,949
 )
 
Revenue deferred during the period, net of revenue recognized
   
195,444
     
229,162
 
                 
Balance at the end of the period
  $
267,842
    $
260,470
 
                 
The Company classified $54 million and $38 million of deferred revenue and customer advances in other long-term liabilities at June 27, 2020 and December 31, 2019, respectively.
The amount of deferred revenue and customer advances equals the transaction price allocated to unfulfilled performance obligations for the period presented. Such amounts are expected to be recognized in the future as follows (in thousands):
 
  
June 27, 2020
 
Deferred revenue and customer advances expected to be recognized in:
   
 
One year or less
 
$
213,402
 
13-24
months
    
34,151
 
25 months and beyond
   
20,289
 
         
Total
  $
267,842