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Intangible Assets and Goodwill
9 Months Ended
Sep. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets and Goodwill
Intangible Assets and Goodwill
The following table summarizes intangible assets as of September 30, 2017 and December 31, 2016 (in thousands):
 
 
Weighted - Average Amortization
Period (Years)
 
September 30, 2017
 
 
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Book Value
Trademarks
 
5
 
$
1,900

 
$
(1,583
)
 
$
317

Technology
 
3
 
1,453

 
(525
)
 
928

Customer relationships
 
5
 
1,300

 
(1,083
)
 
217

Total
 
 
 
$
4,653

 
$
(3,191
)
 
$
1,462

 
 
Weighted - Average Amortization
Period (Years)
 
December 31, 2016
 
 
 
Gross Carrying
Amount
 
Accumulated
Amortization
 
Net Book Value
Trademarks
 
5
 
$
1,900

 
$
(1,298
)
 
$
602

Technology
 
3
 
1,453

 
(161
)
 
1,292

Customer relationship
 
5
 
1,300

 
(888
)
 
412

Total
 
 
 
$
4,653

 
$
(2,347
)
 
$
2,306


Amortization expense related to intangible assets was $0.3 million and $0.2 million for the three months ended September 30, 2017 and 2016, respectively, and $0.8 million and $0.6 million for the nine months ended September 30, 2017 and 2016, respectively.
Goodwill as of September 30, 2017 was $1.9 million, unchanged from December 31, 2016.