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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Goodwill and Intangible Assets
Intangible assets are summarized as follows (in thousands):
 
 
December 31, 2019
 
December 31, 2018
 
 
Gross Carrying Amount
Accumulated Amortization
Net Carrying Amount
 
Gross Carrying Amount
Accumulated Amortization
Net Carrying Amount
Amortized intangible assets
 
 
 
 
 
 
 
 
Licenses
 
$
1,414

$
(1,200
)
$
214

 
$
1,414

$
(1,066
)
$
348

Patents and know how
 
9,099

(5,070
)
4,029

 
9,180

(4,475
)
4,705

Customer and supplier relationships
 
3,761

(2,417
)
1,344

 
4,271

(2,202
)
2,069

Non-compete agreements
 
120

(68
)
52

 
120

(38
)
82

Total amortized intangible assets
 
$
14,394

$
(8,755
)
$
5,639

 
$
14,985

$
(7,781
)
$
7,204

 
 
 
 
 
 
 
 
 
Unamortized intangible assets
 
 
 
 
 
 
 
 
Trade names and trademarks
 
$
1,008

 
$
1,008

 
$
1,008

 
$
1,008

Patents in process
 
1,130

 
1,130

 
1,396

 
1,396

Total intangible assets
 
$
16,532

 
$
7,777

 
$
17,389

 
$
9,608



Amortization expense for the years ended December 31, 2019, 2018, and 2017, was $1.0 million. $1.0 million, and $1.7 million, respectively. Patents and patents in process related write-downs due to abandonment were $1.3 million, $0.0 million, and $0.6 million during the years ended December 31, 2019, 2018, and 2017, respectively and are recorded in Selling, general and administrative expenses.
Expected future amortization of intangible assets as of December 31, 2019, is as follows (in thousands):
 
Estimated
 
Amortization
Year ending December 31,
Expense
2020
$
985

2021
977

2022
955

2023
955

2024
955

Thereafter
812

 
$
5,639


Goodwill is evaluated for impairment on an annual basis on September 30 and in interim periods when events or changes indicate the carrying value may not be recoverable. The Company operates under one reporting unit.
For the year ended December 31, 2019, the Company elected to perform a qualitative analysis to determine whether it was more likely than not that the fair value of its reporting unit was less than their carrying value. As a result of this assessment, the Company determined that it was not necessary to perform a quantitative impairment test and concluded that goodwill was not impaired at December 31, 2019. For the year ended December 31, 2018, the Company performed a quantitative analysis to determine if there was any impairment. As a result of this assessment, the Company determined that there was no impairment for the year ended December 31, 2018.
The following represents the changes in the carrying amount of goodwill for 2019 and 2018 (in thousands):
 
Goodwill
Balance as of January 1, 2018
$
19,976

Activity
—

Balance as of December 31, 2018
19,976

Activity
—

Balance as of December 31, 2019
$
19,976