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Revenue
 9 Months Ended
Sep. 30, 2021
Revenue from Contract with Customer [Abstract]  
Revenue Revenue
Disaggregation of Revenue
Our revenues are derived from contracts with customers related to business outsourcing services that we provide. The following table presents the breakdown of the Company’s revenues by service offering:
Three months ended September 30,Nine months ended September 30,
(in thousands)2021202020212020
Digital Customer Experience$125,310 $76,255 $338,587 $212,817 
Content Security45,376 33,787 124,498 91,401 
AI Operations30,367 12,383 70,861 35,036 
Service revenue$201,053 $122,425 $533,946 $339,254 
The majority of the Company’s revenues are derived from contracts with customers who are located in the United States. However, we deliver our services from geographies outside of the United States. The following table presents the breakdown of the Company’s revenues by geographical location, based on where the services are provided from:
Three months ended September 30,Nine months ended September 30,
(in thousands)2021202020212020
Philippines$103,837 $69,369 $284,096 $188,085 
United States65,866 42,761 175,553 126,835 
Rest of World31,350 10,295 74,297 24,334 
Service revenue$201,053 $122,425 $533,946 $339,254 
Contract Balances
Accounts receivable, net of allowance for doubtful accounts includes $67.6 million and $47.4 million of unbilled revenues as of September 30, 2021 and December 31, 2020, respectively.