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Goodwill and Intangible Assets
 6 Months Ended
Jun. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Goodwill was $97.9 million and $88.4 million as of June 30, 2019 and December 31, 2018, respectively. The following table displays the changes in goodwill:
 
 
Amount
 
 
(in thousands)
Balance at December 31, 2018
 
$
88,420

NetFort acquisition
 
9,446

Balance at June 30, 2019
 
$
97,866


The following table presents details of our intangible assets, which include acquired identifiable intangible assets and capitalized internal-use software costs:
 
 
 
As of June 30, 2019
 
As of December 31, 2018
 
Weighted-
Average
Life (years)
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Book Value
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Book Value
 
 
 
(in thousands)
Intangible assets subject to amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
Developed technology
5.4
 
$
35,855

 
$
(12,761
)
 
$
23,094

 
$
29,771

 
$
(9,741
)
 
$
20,030

Customer relationships
6.7
 
1,000

 
(577
)
 
423

 
1,000

 
(504
)
 
496

Trade names
6.1
 
519

 
(518
)
 
1

 
519

 
(516
)
 
3

Non-compete agreements
2.0
 
40

 
(40
)
 
—

 
40

 
(40
)
 
—

Total acquired intangible assets
 
 
37,414

 
(13,896
)
 
23,518

 
31,330

 
(10,801
)
 
20,529

Internal-use software
 
 
6,938

 
(730
)
 
6,208

 
3,786

 
(360
)
 
3,426

Total intangible assets
 
 
$
44,352

 
$
(14,626
)
 
$
29,726

 
$
35,116

 
$
(11,161
)
 
$
23,955


Amortization expense was $1.9 million and $1.0 million for the three months ended June 30, 2019 and 2018, respectively, and $3.5 million and $2.1 million for the six months ended June 30, 2019 and 2018, respectively.
Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of June 30, 2019 was as follows (in thousands):
2019 (for the remaining six months)
$
3,907

2020
7,771

2021
6,975

2022
4,298

2023
2,667

2024 and thereafter
304

Total
$
25,922


The table above excludes the impact of $3.8 million of capitalized internal-use software costs for projects that have not been completed as of June 30, 2019, and therefore, we have not determined the useful life of the software, nor have all the costs associated with these projects been incurred.