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F. INTANGIBLE ASSETS (Tables)
 12 Months Ended
Dec. 31, 2016
Goodwill and Intangible Assets Disclosure [Abstract]  
Intangible assets

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2016

 

 

    

Gross

    

Accumulated

    

Intangible

 

 

 

Amount

 

amortization

 

assets, net

 

 

 

(in thousands)

 

Patents

 

$
5,987

 

$
(1,997)

 

$
3,990

 

Trademarks

 

 
14

  

 
(11)

 

 
3

 

Total intangible assets

 

$
6,001

 

$
(2,008)

 

$
3,993

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

2015

 

 

    

Gross

    

Accumulated

 

Intangible

 

 

 

Amount

 

amortization

 

assets, net

 

 

 

(in thousands)

 

Patents

 

$
5,446

 

$
(1,551)

 

$
3,895

 

Trademarks

 

 
14

  

 
(9)

 

 
5

 

Total intangible assets

 

$
5,460

 

$
(1,560)

 

$
3,900

 

 

Approximate amortization expense for intangible assets

At December 31, 2016, approximate amortization expense for intangible assets was as follows (in thousands):

 

 

 

 

 

 

2017

    

$
466

 

2018

 

 
466

 

2019

 

 
466

 

2020

 

 
466

 

2021

 

 
467

 

thereafter

 

 
1,662

 

 

 

$
3,993