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Intangible Assets
 9 Months Ended
Sep. 30, 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:
    
 
September 30, 2019
 
December 31, 2018
 
Gross
 
Accumulated amortization
 
Net
 
Gross
 
Accumulated amortization
 
Net
Customer relationships
$
1,599

 
$
(300
)
 
$
1,299

 
$
1,615

 
$
(206
)
 
$
1,409

Trade names
533

 
(34
)
 
499

 
547

 
(17
)
 
530

Technology
156

 
(35
)
 
121

 
160

 
(18
)
 
142

Long term supply contracts
144

 
(44
)
 
100

 
143

 
(37
)
 
106

Patents
14

 
(8
)
 
6

 
14

 
(8
)
 
$
6

 
$
2,446


$
(421
)

$
2,025

 
$
2,479

 
$
(286
)
 
$
2,193



Total amortization expense of intangible assets was $43 and $140, and $51 and $103, for the three and nine months ended September 30, 2019 and 2018.