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Revenue Recognition
 12 Months Ended
Dec. 31, 2020
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 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 cust
o
mer advances for the year ended December 31, 2020, 2019 and 2018 (in thousands):
 
 
  
December 31,
 
 
  
2020
 
 
2019
 
 
2018
 
Balance at the beginning of the period
  
$
213,695
 
 
$
204,257
 
 
$
192,589
 
Recognition of revenue included in balance at beginning of the period
  
 
(198,209
) 
 
 
(176,981
) 
 
 
(159,258
) 
Revenue deferred during the period, net of revenue recognized
  
 
224,273
 
 
 
186,419
 
 
 
170,926
 
    
 
 
    
 
 
    
 
 
  
Balance at the end of the period
  
$
239,759
 
 
$
213,695
 
 
$
204,257
 
    
 
 
    
 
 
    
 
 
  
The Company classified $42 million and $38 million of deferred revenue and customer advances in other long-term liabilities at December 31, 2020 and 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):
 
 
  
December 31, 2020
 
Deferred revenue and customer advances expected to be recognized in:
  
      
One year or less
  
$
198,240
 
13-24
months
  
 
23,647
 
25 months and beyond
  
 
17,872
 
    
 
 
  
Total
  
$
239,759