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Intangible Assets (Tables)
 9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Components of Intangible assets
Intangible assets consist of the following:
 
September 30, 2019
 
Cost
 
Accumulated Amortization
 
Net
Raw material supply agreement
$
6,230

 
$
(3,245
)
 
$
2,985

Renewable diesel technology
8,300

 
(2,951
)
 
5,349

Ground lease
200

 
(168
)
 
32

Acquired customer relationships
4,747

 
(1,412
)
 
3,335

Trademarks
704

 
—

 
704

Total intangible assets
$
20,181

 
$
(7,776
)
 
$
12,405

 
December 31, 2018
 
Cost
 
Accumulated Amortization
 
Net
Raw material supply agreement
$
6,230

 
$
(2,866
)
 
$
3,364

Renewable diesel technology
8,300

 
(2,536
)
 
5,764

Ground lease
200

 
(157
)
 
43

Acquired customer relationships
4,747

 
(976
)
 
3,771

Trademarks
704

 
—

 
704

Total intangible assets
$
20,181

 
$
(6,535
)
 
$
13,646
Estimated Amortization Expense
The estimated intangible asset amortization expense for the remainder of 2019 through 2025 and thereafter is as follows:
October 1, 2019 through December 31, 2019
$
474

2020
1,684

2021
1,689

2022
1,683

2023
1,690

2024
1,697

2025 and thereafter
3,488

Total
$
12,405