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Goodwill and Intangible Assets
6 Months Ended
Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets
Goodwill and Intangible Assets
Goodwill was $75.1 million as of June 30, 2017 and December 31, 2016.
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, 2017
 
As of December 31, 2016
 
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
6.3
 
$
11,231

 
$
(3,995
)
 
$
7,236

 
$
11,231

 
$
(3,118
)
 
$
8,113

Customer relationships
6.7
 
1,000

 
(274
)
 
726

 
1,000

 
(197
)
 
803

Trade names
6.1
 
519

 
(503
)
 
16

 
519

 
(496
)
 
23

Non-compete agreements
2.0
 
40

 
(40
)
 

 
40

 
(33
)
 
7

Total acquired intangible assets
 
 
12,790

 
(4,812
)
 
7,978

 
12,790

 
(3,844
)
 
8,946

Internal-use software
 
 
316

 

 
316

 

 

 

Total intangible assets
 
 
$
13,106

 
$
(4,812
)
 
$
8,294

 
$
12,790

 
$
(3,844
)
 
$
8,946


Amortization expense was $0.5 million and $0.6 million for the three months ended June 30, 2017 and 2016, respectively, and $1.0 million and $1.2 million for the six months ended June 30, 2017 and 2016, respectively.
Estimated future amortization expense of the acquired identifiable intangible assets as of June 30, 2017 is as follows (in thousands):
2017 (for the remaining six months)
$
962

2018
1,886

2019
1,859

2020
1,837

2021
1,332

2022 and thereafter
102

Total
$
7,978



The costs associated with the development of internal-use software are not included in the table above, as the projects are currently in development. As such, we have not determined the useful life of the software, nor have all the costs associated with this project been incurred.