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Intangible Assets
 12 Months Ended
Dec. 31, 2022
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Intangible Assets Intangible Assets

    Intangible assets as of December 31, 2022 and 2021 consist of the following:
December 31,
20222021
(In thousands)Useful Life (in years)Gross Carrying AmountAccumulated AmortizationGross Carrying AmountAccumulated Amortization
Acquired technology
3 to 7
$42,022 $41,894 $43,034 $42,281 
Customer relationships
5 to 12
34,386 23,323 39,814 20,653 
Patents and trademarks
10 to 20
13,518 12,227 13,549 12,193 
        Total$89,926 $77,444 $96,397 $75,127 
Amortization expense was $4.1 million, $5.9 million, and $9.1 million for the years ended December 31, 2022, 2021, and 2020, respectively.
Certain intangible assets are denominated in local currencies and are subject to currency fluctuations.

    During the year ended December 31, 2022, the Company performed an impairment review of the customer relationships intangible assets obtained in its 2018 acquisition of Dealflo Limited (“Dealflo”). The impairment review was triggered by the Company’s July 2022 notification to customers regarding its intent to gradually sunset its Dealflo solution in the months leading up to December 31, 2023. As a result, all Dealflo solution customer contracts will terminate on or before December 31, 2023. The results of the impairment review indicated that the carrying value of the Dealflo customer relationships exceeded the fair value, and the Company recorded a $3.8 million impairment charge on the entire remaining value of the asset during the year ended December 31, 2022. The charge is included in “Impairment of intangible assets” on the consolidated statements of operations and is included in "Operating income" of the Security Solutions reportable operating segment.
There were no additional impairments of intangible assets recorded during the years ended December 31, 2022, 2021, and 2020.
The estimated future amortization expense of intangible assets as of December 31, 2022, is as follows:
2023$2,338 
20242,335 
20252,334 
20262,328 
20272,123 
Thereafter263 
Subject to amortization11,721 
Trademarks761 
Total intangible assets$12,482