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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets

Goodwill
The changes in the carrying amount of goodwill for the year ended December 31, 2019 are as follows (amounts in thousands):
 
Business
 
Consumer
 
Total
Balance as of December 31, 2018
$
87,007

 
$
8,024

 
$
95,031

Adjustments to goodwill:
 
 
 
 
 
Foreign exchange adjustments
(44
)
 
—

 
(44
)
Balance as of December 31, 2019
$
86,963

 
$
8,024

 
$
94,987

The changes in the carrying amount of goodwill for the year ended December 31, 2018 are as follows (amounts in thousands):
 
Business
 
Consumer
 
Total
Balance as of December 31, 2017
$
72,507

 
$
8,024

 
$
80,531

Adjustments to goodwill:
 
 
 
 


Acquisitions
14,606

 
—

 
14,606

Foreign exchange adjustments
(106
)
 
—

 
(106
)
Balance as of December 31, 2018
$
87,007

 
$
8,024

 
$
95,031


The total accumulated goodwill impairment charges are $23.5 million through December 31, 2019. No impairment was recognized for the years ended December 31, 2019, 2018, and 2017.
Intangible Assets
Intangible assets are summarized as follows (see Note 8) (amounts in thousands):

December 31, 2019

Gross
Carrying
Amount

Accumulated
Amortization

Net Carrying Amount

Weighted
Average
Amortization
Period
Amortizing intangible assets:










Technology
$
30,413

 
$
(25,187
)

$
5,226


5.3 years
Customer relationships
16,964

 
(12,958
)

4,006


8.4 years
Patents
3,267

 
(714
)

2,553


12.8 years
Other
262

 
(235
)

27


2.7 years
Total
$
50,906


$
(39,094
)

$
11,812




 
December 31, 2018
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net Carrying Amount
 
Weighted
Average
Amortization
Period
Amortizing intangible assets:
 
 
 
 
 
 
 
Technology
$
30,447

 
$
(23,615
)
 
$
6,832

 
5.3 years
Customer relationships
17,219

 
(11,786
)
 
5,433

 
8.4 years
Patents
2,074

 
(534
)
 
1,540

 
12.4 years
Other
262

 
(235
)
 
27

 
2.7 years
Total
$
50,002

 
$
(36,170
)
 
$
13,832

 


Amortization expense is calculated over the estimated useful life of the asset. Aggregate amortization expense for intangible assets was $2.9 million, $2.8 million and $4.7 million for the years ended December 31, 2019, 2018 and 2017, respectively. For the years ended December 31, 2019, 2018 and 2017, a portion of this amortization is included in cost of revenue. Estimated amortization expense for the next five years are as follows (amounts in thousands):
 
 
Estimated Amortization Expense
2020
 
$
2,734

2021
 
2,520

2022
 
2,155

2023
 
904

2024
 
705

Thereafter
 
2,794

Total
 
$
11,812