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Goodwill and Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
Goodwill and Intangible Assets Disclosure [Abstract]  
Changes in the Carrying Amount of Goodwill
The changes in the carrying amount of goodwill for the nine months ended September 30, 2021 are as follows:
Nine months ended September 30, 2021
(in thousands)
Balance as of December 31, 2020$635,590 
Foreign currency translation and other adjustments45 
Balance as of September 30, 2021
$635,635 
Schedule of Intangible Assets
As of September 30, 2021 and December 31, 2020, our intangible assets consisted of the following:
As of September 30, 2021As of December 31, 2020
Gross carrying valueAccumulated amortizationNet carrying valueGross carrying valueAccumulated amortizationNet carrying value
(in thousands)
Intangible assets:
Customer relationships$69,100 $(8,638)$60,462 $69,100 $(2,053)$67,047 
Developed technology49,500 (9,900)39,600 49,500 (2,475)47,025 
Trade names3,300 (1,100)2,200 3,300 (275)3,025 
Internet protocol addresses4,984 (848)4,136 2,891 (578)2,313 
Backlog2,200 (1,100)1,100 2,200 (275)1,925 
In-process research and development ("IPR&D")368 — 368 368 — 368 
Domain name
39 — 39 39 — 39 
Total intangible assets$129,491 $(21,586)$107,905 $127,398 $(5,656)$121,742 
Expected Amortization Expense of Intangible Assets
The annual expected amortization expense of intangible assets subject to amortization as of September 30, 2021 is as follows:
As of September 30, 2021
(in thousands)
Remainder of 2021$5,313 
202220,974 
202319,874 
202419,040 
202516,561 
Thereafter25,771 
Total$107,533