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Goodwill and Intangible Assets
 12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill and Intangible Assets Intangible Assets
Intangible assets are summarized as follows (in thousands):
 
 
December 31, 2018
 
December 31, 2017
 
 
Gross Carrying Amount
Accumulated Amortization
Net Carrying Amount
 
Gross Carrying Amount
Accumulated Amortization
Net Carrying Amount
Amortized intangible assets
 
 
 
 
 
 
 
 
Licenses
 
$
1,414

$
(1,066
)
$
348

 
$
1,009

$
(1,009
)
$
—

Patents and know how
 
9,180

(4,475
)
4,705

 
8,732

(3,840
)
4,892

Customer and supplier relationships
 
4,271

(2,202
)
2,069

 
4,271

(1,891
)
2,380

Non-compete agreements
 
120

(38
)
82

 
120

(8
)
112

Total amortized intangible assets
 
$
14,985

$
(7,781
)
$
7,204

 
$
14,132

$
(6,748
)
$
7,384

 
 
 
 
 
 
 
 
 
Unamortized intangible assets
 
 
 
 
 
 
 
 
Trade names and trademarks
 
$
1,008

 
$
1,008

 
$
1,008

 
$
1,008

Patents in process
 
1,396

 
1,396

 
1,641

 
1,641

Total intangible assets
 
$
17,389

 
$
9,608

 
$
16,781

 
$
10,033


Amortization expense for the years ended December 31, 2018, 2017, and 2016, was $1.0 million, $1.7 million, and $2.1 million, respectively. Patents and patents in process related write-downs due to abandonment were $0.0 million and $0.6 million during the years ended December 31, 2018 and 2017, respectively.
Expected future amortization of intangible assets as of December 31, 2018, is as follows (in thousands):
 
Estimated
 
Amortization
Year ending December 31,
Expense
2019
$
976

2020
976

2021
969

2022
946

2023
946

Thereafter
2,391

 
$
7,204


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 years ended December 31, 2018 and 2017, 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 years ended December 31, 2018 and 2017.
The following represents the changes in the carrying amount of goodwill 2018 and 2017 (in thousands):
 
Goodwill
Balance as of January 1, 2017
$
20,203

Divestment of Stability
(227
)
Balance as of December 31, 2017
19,976

Activity
—

Balance as of December 31, 2018
$
19,976