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Revenue Recognition
 12 Months Ended
Dec. 31, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Recognition
3    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 i
n
 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 year ended December 31, 2021, 2020 and 2019 (in thousands):
 
    
December 31,
  
    
2021
    
2020
    
2019
  
Balance at the beginning of the period
    $ 239,759     $ 213,695     $ 204,257  
Recognition of revenue included in balance at beginning of the period
      (216,920 )      (198,209 )      (176,981 ) 
Revenue deferred during the period, net of revenue recognized
      250,759       224,273       186,419  
    
 
 
    
 
 
    
 
 
  
Balance at the end of the period
    $ 273,598     $ 239,759     $ 213,695  
    
 
 
    
 
 
    
 
 
  
The Company classified $46 million and $42 million of deferred revenue and customer advances in other long-term liabilities at December 31, 2021 and 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):

    
December 31, 2021
  
Deferred revenue and customer advances expected to be recognized in:
         
One year or less
    $ 227,561  
13-24
months
      26,840  
25 months and beyond
      19,197  
    
 
 
  
Total
    $ 273,598