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Goodwill and Intangible Assets, Net
3 Months Ended
Mar. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets, Net
will and Intangible Assets, Net

Intangible assets consist primarily of developed technology and patent licenses acquired in business combinations. Acquired intangibles are amortized on a straight-line basis over the respective estimated useful lives of the assets.

The carrying values of intangible assets are as follows (in thousands, except for years):

 
 
 
 
 
 
 
March 31, 2018
 
Weighted Average Life (Years)
 
Weighted Remaining Average Life (Years)
 
Cost
 
Accumulated Amortization
 
Net Book Value
Developed technology
5
 
4.5
 
$
12,156

 
$
(1,068
)
 
$
11,088

Patent licenses
14
 
6.4
 
1,388

 
(747
)
 
641

     Total intangibles subject to amortization
 
 
 
 
$
13,544

 
$
(1,815
)
 
11,729

Intangible assets not subject to amortization
 
 
 
 
 
 
 
 
40

     Total intangible assets, net
 
 
 
 
 
 
 
 
$
11,769

 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
December 31, 2017
 
Weighted Average Life (Years)
 
Weighted Remaining Average Life (Years)
 
Cost
 
Accumulated Amortization
 
Net Book Value
Developed technology
5
 
4.8
 
$
14,067

 
$
(2,371
)
 
$
11,696

Patent Licenses
14
 
6.7
 
1,388

 
(723
)
 
665

     Total intangibles subject to amortization
 
 
 
 
$
15,455

 
$
(3,094
)
 
12,361

Intangible assets not subject to amortization
 
 
 
 
 
 
 
 
40

     Total intangible assets, net
 
 
 
 
 
 
 
 
$
12,401



Intangible asset amortization expense was $0.6 million and $0.1 million for the three months ended March 31, 2018 and 2017, respectively.

As of March 31, 2018, the Company expects amortization expense in future periods to be as follows (in thousands):

2018 (remaining nine months)
$
1,899

2019
2,531

2020
2,531

2021
2,531

2022
2,071

2023 and thereafter
166

Total expected future amortization expense
$
11,729


Goodwill, which is not subject to amortization, totaled $1.5 million as of each of March 31, 2018 and December 31, 2017.