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Goodwill and Acquired Intangible Assets
3 Months Ended
Mar. 31, 2022
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Acquired Intangible Assets Goodwill and Acquired Intangible Assets
Goodwill
We recorded as goodwill the excess of the purchase price over the estimated fair values of identifiable assets and liabilities acquired as part of the Nitro acquisition in the first quarter of 2022. Goodwill is not amortized but is tested periodically for impairment. We plan to test goodwill for impairment annually in the fourth quarter of the year, or more frequently if we believe that indicators of impairment exist. At March 31, 2022 we had $51 million in total Goodwill. See Note 2, “Significant Accounting Policies” for additional details on our acquisition of Nitro.
Acquired Intangible Assets
Our intangible assets include acquired tradename and trademarks, customer relationships, and developed technology. We review our long-lived assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable.
Acquired intangible assets include the following:

March 31, 2022
(Dollars in thousands)
Useful Life
(in years)(1)
Cost BasisAccumulated AmortizationNet
Tradename and trademarks10$68,470 $(515)$67,955 
Customer relationships55,670 (186)5,484 
Developed technology31,260 (32)1,228 
Total acquired intangible assets$75,400 $(733)$74,667 
(1)     The weighted average useful life of acquired intangible assets related to the Nitro acquisition is 9.51 years.
We recorded amortization of acquired intangible assets totaling approximately $1 million in the three months ended March 31, 2022. There was no amortization of acquired intangible assets recorded in the three months ended March 31, 2021. We will continue to amortize our intangible assets with definite useful lives over their remaining estimated useful lives. We estimate amortization expense associated with these intangible assets will be approximately $8 million, $9 million, $8 million, $8 million and $7 million in 2022, 2023, 2024, 2025 and 2026, respectively.