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Revenue Recognition
 6 Months Ended
Jun. 28, 2025
Revenue from Contract with Customer [Abstract]  
Revenue Recognition
2 Revenue Recognition
The Company’s deferred revenue liabilities in 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 28, 2025 and June 29, 2024 (in thousands):
 
 
  
June 28, 2025
 
  
June 29, 2024
 
Balance at the beginning of the period
    $ 320,046      $ 323,516  
Recognition of revenue included in balance at beginning of the period
      (202,387 )       (192,050 ) 
Revenue deferred during the period, net of revenue recognized
      302,644        251,599  
  
 
 
     
 
 
  
Balance at the end of the period
    $ 420,303      $ 383,065  
  
 
 
     
 
 
  
The Company classified $86 million and $69 million of deferred revenue and customer advances in other long-term liabilities at June 28, 2025 and December 31, 2024, respectively.
The amount of unfulfilled performance obligations as of June 28, 2025, and the time such amounts are expected to be recognized in the future, is as follows (in thousands):
 
    
June 28, 2025
  
Unfulfilled performance obligations expected to be recognized in:
   
One year or less
    $ 340,942  
13-24
months
      45,852  
25 months and beyond
      40,601  
  
 
 
  
Total
    $ 427,395