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Goodwill and Other Intangible Assets
6 Months Ended
Jun. 30, 2017
Goodwill and Other Intangible Assets [Abstract]  
Goodwill and Other Intangible Assets
Note 2. Goodwill and Other Intangible Assets

Goodwill

There was no change in the goodwill balance as of June 30, 2017 as compared to December 31, 2016.

Other Intangible Assets

Other intangible assets consisted of approximately the following at June 30, 2017 and December 31, 2016:
 
  
June 30, 2017
  
December 31, 2016
 
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
 
Remaining
 Useful Life
  
Gross
Carrying
Amount
  
Accumulated
Amortization
  
 
Remaining
Useful Life
 
Developed technology
 
$
6,200,000
  
$
1,993,000
   
4.75
  
$
6,200,000
  
$
1,550,000
   
5.25
 
Patents
  
5,653,000
   
5,628,000
   
7.75
   
5,653,000
   
5,616,000
   
8.25
 
Trademarks and trade names
  
190,000
   
79,000
   
7.75
   
190,000
   
74,000
   
8.25
 
Customer relationships
  
7,270,000
   
3,310,000
   
2.75
   
7,270,000
   
2,590,000
   
3.25
 
  
$
19,313,000
  
$
11,010,000
      
$
19,313,000
  
$
9,830,000
     
Accumulated amortization
  
11,010,000
           
9,830,000
         
                         
Net book value of amortizable intangible assets
 
$
8,303,000
       
3.73
  
$
9,483,000
       
4.23
 

For the six months ended June 30, 2017 and 2016, amortization of intangible assets charged to operations was approximately $1,179,000 and $1,182,000, respectively.

Estimated amortization expense for all intangible assets as of June 30, 2017 is approximately as follows:

July 1, 2017 through December 31, 2017
 
$
1,174,000
 
2018
  
2,347,000
 
2019
  
2,341,000
 
2020
  
1,254,000
 
2021
  
894,000
 
Thereafter
  
293,000
 
Total
  
8,303,000