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Goodwill and Other Intangible Assets, Net (Tables)
9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Carrying Amounts of Goodwill
The changes in the carrying amounts of goodwill for the nine months ended September 30, 2019 were as follows:
 
(in thousands)
Goodwill at December 31, 2018
$
39,646

Foreign currency translation
67

Goodwill at September 30, 2019
$
39,713


Components of Other Intangible Assets
The gross carrying amount, accumulated amortization and net book value of intangible assets at the end of each period were as follows:
 
As of
 
September 30, 2019
 
December 31, 2018
(in thousands)
Gross Carrying Amount
 
Accumulated Amortization
 
Net Book Value
 
Gross Carrying Amount
 
Accumulated Amortization
 
Net Book Value
Customer and contractual relationships
$
9,827

 
$
(2,543
)
 
$
7,284

 
$
6,109

 
$
(1,880
)
 
$
4,229

Internal-use software
11,103

 
(6,370
)
 
4,733

 
11,262

 
(5,108
)
 
6,154

Intellectual property
840

 
(23
)
 
817

 

 

 

Total
$
21,770

 
$
(8,936
)
 
$
12,834

 
$
17,371

 
$
(6,988
)
 
$
10,383


Amortization Expense Expected for Next Five Years
Estimated future amortization expense by year is as follows:
Years Ending December 31,
(in thousands)
2019 (remaining)
$
769

2020
2,641

2021
2,155

2022
1,562

2023
1,100

Thereafter
4,607

     Total
$
12,834