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Revenue Recognition
 9 Months Ended
Oct. 02, 2021
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 October 2, 2021 and September 26, 2020 (in thousands):
 
    
October 2, 2021
     
September 26, 2020
  
Balance at the beginning of the period
    $ 239,759      $ 213,695  
Recognition of revenue included in balance at beginning of the period
      (197,279 )       (177,667 ) 
Revenue deferred during the period, net of revenue recognized
      264,184        213,895  
    
 
 
     
 
 
  
Balance at the end of the period
    $ 306,664      $ 249,923  
    
 
 
     
 
 
  
The Company classified $44 million and $42 million of deferred revenue and customer advances in other long-term liabilities at October 2, 2021 and December 31, 2020, 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):
 
    
October 2, 2021
  
Deferred revenue and customer advances expected to be recognized in:
         
One year or less
    $ 262,758  
13-24
months
      25,076  
25 months and beyond
      18,830  
    
 
 
  
Total
    $ 306,664