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Intangible Assets (Tables)
 12 Months Ended
Dec. 31, 2017
Intangible Assets [Abstract]  
Intangible Assets Subject to Amortization
Intangible assets subject to amortization at December 31, 2017 consisted of the following.

(In thousands)
 
Gross Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
 
 
 
 
 
 
 
 
 
 
 
Acquired technology
 
$
1,733
 
 
$
(1,733
) 
 
 
—
 
Distributor and provider networks
  
8,709
   
(8,709
)
  
—
 
Total
 
$
10,442
 
 
$
(10,442
) 
 
$
—
 
 
Intangible assets subject to amortization at December 31, 2016 consisted of the following.

(In thousands)
 
Gross Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
 
 
 
 
 
 
 
 
 
 
 
Acquired technology
 
$
6,422
 
 
$
(6,422
) 
 
 
—
 
Distributor and provider networks
  
8,709
   
(8,709
)
  
—
 
Total
 
$
15,131
 
 
$
(15,131
) 
 
$
—