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Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2018
Intangible Assets  
Schedule of gross carrying amount and related accumulated amortization of the intangible assets

 

The following sets forth the gross carrying amount and related accumulated amortization of the intangible assets, in thousands of dollars:

 

 

 

Weighted-

 

June 30,

 

December 31,

 

 

 

Average Life

 

2018

 

2017

 

 

 

 

 

(unaudited)

 

 

 

Capitalized patent defense costs

 

4.5 -8.75 years

 

$
44,546

 

$
44,185

 

Less accumulated amortization

 

 

 
(10,752

)
(8,166

)

 

 

 

 

 

 

 

 

 

 

 

 

$
33,794

 

$
36,019