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Intangible Assets and Goodwill
 6 Months Ended
Jun. 30, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill
Intangible Assets and Goodwill
The following table summarizes intangible assets as of June 30, 2018 and December 31, 2017 (in thousands):
 
 
Weighted - Average Amortization
Period (Years)
 
June 30, 2018
 
 
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Book Value
Trademarks
 
5
 
$
1,900

 
$
(1,868
)
 
$
32

Technology
 
3
 
1,678

 
(913
)
 
765

Customer relationships
 
5
 
1,300

 
(1,278
)
 
22

Total
 
 
 
$
4,878

 
$
(4,059
)
 
$
819

 
 
Weighted - Average Amortization
Period (Years)
 
December 31, 2017
 
 
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Book Value
Trademarks
 
5
 
$
1,900

 
$
(1,678
)
 
$
222

Technology
 
3
 
1,453

 
(646
)
 
807

Customer relationships
 
5
 
1,300

 
(1,148
)
 
152

Total
 
 
 
$
4,653

 
$
(3,472
)
 
$
1,181


Amortization expense related to intangible assets was $0.3 million for the three months ended June 30, 2018 and 2017 and $0.6 million for the six months ended June 30, 2018 and 2017.
Goodwill was $2.1 million and $1.9 million as of June 30, 2018 and December 31, 2017, respectively.