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Goodwill and Acquired Intangible Assets
9 Months Ended
Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets Goodwill and Acquired Intangible Assets
Acquired intangible assets subject to amortization consist of the following (in thousands):
 
 As of September 30, 2022
CostAccumulated
Amortization
NetWeighted Average Remaining Useful Life
   (In years)
Developed technology$28,000 $(17,267)$10,733 2.3
Customer relationships14,300 (10,159)4,141 2.9
 $42,300 $(27,426)$14,874  
 
 As of December 31, 2021
CostAccumulated
Amortization
NetWeighted Average Remaining Useful Life
   (In years)
Developed technology$28,000 $(13,734)$14,266 3.0
Customer relationships14,300 (8,233)6,067 3.2
 $42,300 $(21,967)$20,333  
 
Amortization expense of acquired intangible assets was $2 million for each of the three months ended September 30, 2022 and 2021, and $5 million for each of the nine months ended September 30, 2022 and 2021.
Estimated future amortization expense as of September 30, 2022 is as follows (in thousands):
Remainder of 2022$1,838 
20236,579 
20244,837 
2025972 
2026488 
Thereafter160 
$14,874 
 
As of September 30, 2022 and December 31, 2021, the carrying amount of goodwill was $177 million. There was no material change to the carrying amount of goodwill for the nine months ended September 30, 2022.