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Intangible Assets
 3 Months Ended
Mar. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible Assets
Intangible Assets

Gross carrying amounts and accumulated amortization of finite-lived intangible assets by major class were as follows:
    
 
March 31, 2019
 
December 31, 2018
 
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
Customer relationships
$
1,607

 
$
(236
)
 
$
1,371

 
$
1,615

 
$
(206
)
 
$
1,409

Trade names
541

 
(23
)
 
518

 
547

 
(17
)
 
530

Technology
158

 
(23
)
 
135

 
160

 
(18
)
 
142

Long term supply contracts
146

 
(40
)
 
106

 
143

 
(37
)
 
106

Patents
$
14

 
$
(8
)
 
$
6

 
$
14

 
$
(8
)
 
$
6

 
$
2,466


$
(330
)

$
2,136

 
$
2,479

 
$
(286
)
 
$
2,193



Total amortization expense of intangible assets was $47 and $11 for the three months ended March 31, 2019 and 2018.