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Revenue Recognition
 9 Months Ended
Sep. 26, 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 nine months ended September 26, 2020 and September 28, 2019 (in thousands):
 
    
September 26,
2020
     
September 28,
2019
  
Balance at the beginning of the period
    $ 213,695      $ 204,257  
Recognition of revenue included in balance at beginning of the period
      (177,667 )       (174,929 ) 
Revenue deferred during the period, net of revenue recognized
      213,895        206,093  
  
 
 
     
 
 
  
Balance at the end of the period
    $ 249,923      $ 235,421  
  
 
 
     
 
 
  
The Company classified $39 million and $38 million of deferred revenue and customer advances in other long-term liabilities at September 26, 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):
 
    
September 26, 2020
  
Deferred revenue and customer advances expected to be recognized in:
   
One year or less
    $ 211,348  
13-24 months
      22,452  
25 months and beyond
      16,123  
  
 
 
  
Total
    $ 249,923