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Intangible Assets (Tables)
3 Months Ended
Mar. 31, 2021
Intangible Assets, Net (Excluding Goodwill) [Abstract]  
Schedule of Intangible Assets

Intangible assets consist of the following: 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

March 31, 2021

 

December 31, 2020

(In thousands)

 

Gross
Carrying
Amount


Accumulated
Amortization


Net


Gross
Carrying
Amount


Accumulated
Amortization


Net

Patents

 

$

1,866

 

 

$

(1,585

)

 

$

281

 

 

$

1,832

 

 

$

(1,542

)

 

$

290

 

Software

 

206

 

 

(206

)

 

 

 

206

 

 

(200

)

 

6

 

Marketing assets and customer relationships

 

86

 

 

(64

)

 

22

 

 

101

 

 

(72

)

 

29

 

    Total intangible assets

 

$

2,158

 

 

$

(1,855

)

 

$

303

 

 

$

2,139

 

 

$

(1,814

)

 

$

325

 

Schedule of Amortization Expense For Intangible Assets

Amortization expense in the three months ended March 31, 2021 and the three months ended March 31, 2020 was as follows:  

 









 


Three Months Ended March 31,

(In thousands)


2021
2020

Patents


$ 43

$ 38

Software



6


8

Marketing assets and customer relationships



2


2

    Total amortization expense


$ 51

$ 48