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Goodwill and Intangible Assets
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets

Goodwill consists of the following (in thousands):
 
Nine Months Ended September 30, 2019
 
Year Ended December 31, 2018
Beginning balance
$
149,524

 
$
125,272

Additions due to acquisitions
—

 
24,673

Foreign currency translation adjustment
(456
)
 
(421
)
Ending balance
$
149,068

 
$
149,524



Intangible assets as of September 30, 2019 and December 31, 2018 consist of the following (in thousands, except weighted-average amortization period):
 
September 30, 2019
 
Weighted-Average Amortization
Period (in months)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Developed technologies and content library
71

 
$
31,667

 
$
(16,757
)
 
$
14,910

Customer lists
47

 
9,970

 
(7,872
)
 
2,098

Trade names
44

 
6,113

 
(5,681
)
 
432

Non-compete agreements
31

 
2,018

 
(1,865
)
 
153

Indefinite-lived trade name
—

 
3,600

 
—

 
3,600

Foreign currency translation adjustment
—

 
(571
)
 
—

 
(571
)
Total intangible assets
61

 
$
52,797

 
$
(32,175
)
 
$
20,622

 
 
December 31, 2018
 
Weighted-Average Amortization
Period (in months)
 
Gross
Carrying
Amount
 
Accumulated
Amortization
 
Net
Carrying
Amount
Developed technologies and content library
71

 
$
31,667

 
$
(13,737
)
 
$
17,930

Customer lists
47

 
9,970

 
(6,847
)
 
3,123

Trade names
44

 
6,113

 
(4,863
)
 
1,250

Non-compete agreements
31

 
2,018

 
(1,735
)
 
283

Indefinite-lived trade name
—

 
3,600

 
—

 
3,600

Foreign currency translation adjustment
—

 
(271
)
 
—

 
(271
)
Total intangible assets
61

 
$
53,097

 
$
(27,182
)
 
$
25,915



During the three and nine months ended September 30, 2019, amortization expense related to our acquired intangible assets totaled approximately $1.5 million and $5.0 million, respectively. During the three and nine months ended September 30, 2018, amortization expense related to our acquired intangible assets totaled approximately $1.8 million and $4.7 million, respectively.

As of September 30, 2019, the estimated future amortization expense related to our finite-lived intangible assets is as follows (in thousands):
Remaining three months of 2019
$
1,455

2020
4,816

2021
3,423

2022
2,943

2023
2,276

Thereafter
2,109

Total
$
17,022