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Goodwill and Other Intangible Assets
3 Months Ended
Mar. 31, 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 March 31, 2017.
 
Other Intangible Assets

Other intangible assets consisted of approximately the following at March 31, 2017 and December 31, 2016:

  
March 31, 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
  
$
1,771,000
   
5.0
  
$
6,200,000
  
$
1,550,000
   
5.25
 
Patents
  
5,653,000
   
5,623,000
   
8.0
   
5,653,000
   
5,616,000
   
8.25
 
Trademarks and trade names
  
190,000
   
77,000
   
8.0
   
190,000
   
75,000
   
8.25
 
Customer relationships
  
7,270,000
   
2,950,000
   
3.0
   
7,270,000
   
2,590,000
   
3.25
 
  
$
19,313,000
  
$
10,421,000
      
$
19,313,000
  
$
9,831,000
     
Accumulated amortization
  
10,421,000
           
9,831,000
         
                         
Net book value of amortizable intangible assets
 
$
8,892,000
       
3.98
  
$
9,482,000
       
4.23
 

For the three months ended March 31, 2017 and 2016, amortization of intangible assets charged to operations was approximately $591,000 for both periods.

Estimated amortization expense for all intangible assets as of March 31, 2017 is approximately as follows:

April 1, 2017 through December 31, 2017
 
$
1,760,000
 
2018
  
2,345,000
 
2019
  
2,339,000
 
2020
  
1,252,000
 
2021
  
892,000
 
Thereafter
  
228,000