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PURCHASED INTANGIBLE ASSETS
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
PURCHASED INTANGIBLE ASSETS
PURCHASED INTANGIBLE ASSETS
 
Our purchased intangible assets consisted of the following as of September 30, 2019:
 
Gross
 
Accumulated
Amortization
 
Net
Core technology
$
17,999

 
$
(11,748
)
 
$
6,251

Customer relationships
33,751

 
(33,751
)
 
—

Trademarks / Trade names
1,930

 
(1,930
)
 
—

Total intangible assets
$
53,680

 
$
(47,429
)
 
$
6,251

 
Our purchased intangible assets consisted of the following as of December 31, 2018:
 
Gross
 
Accumulated
Amortization
 
Net
Core technology
$
18,916

 
$
(10,866
)
 
$
8,050

Customer relationships
37,122

 
(36,583
)
 
539

Trademarks / Trade names
2,031

 
(2,031
)
 
—

Total intangible assets
$
58,069

 
$
(49,480
)
 
$
8,589


 
The change in the gross value of our purchased intangible assets from December 31, 2018 to September 30, 2019 was due to foreign currency translation and an adjustment due to the recognition of tax benefit of tax amortization previously applied to certain goodwill related to the NobelClad and DynaEnergetics reporting units. After the goodwill was written off at September 30, 2017 and December 31, 2015, respectively, the tax amortization reduces other noncurrent intangible assets related to the historical acquisition.