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Intangible Assets
 12 Months Ended
Dec. 31, 2016
Intangible Assets [Abstract]  
Intangible Assets
5.
 Intangible Assets

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
) 
 
$
—
 

Intangible assets subject to amortization at December 31, 2015 consisted of the following:

(In thousands)
 
Gross Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
 
 
 
 
 
 
 
 
 
 
 
Acquired technology
 
$
6,422
 
 
$
(6,422
) 
 
$
—
 
Distributor and provider networks
  
8,709
   
(8,232
)
  
477
 
Total
 
$
15,131
 
 
$
(14,654
) 
 
$
477
 

As all intangible assets subject to amortization were fully amortized as of December 31, 2016, no amortization expense is expected over the next five years and thereafter.  Total amortization expense for the years ended December 31, 2016, 2015, and 2014 was $0.5 million for each of these years.

Intangible assets not subject to amortization at December 31, 2016 and 2015 consist of a tradename of $29.0 million.
 
Intangible assets related to the disposition of the TPHS business include the following:

(In thousands)
 
Gross Carrying
Amount
 
 
Accumulated
Amortization
 
 
Net
 
 
 
 
 
 
 
 
 
 
 
Customer contracts
 
$
12,170
 
 
$
(12,044
) 
 
$
126
 
Acquired technology
 
 
12,126
 
 
 
(11,525
) 
 
 
601
 
Patents
  
24,832
   
(19,121
)
  
5,711
 
Perpetual license to survey-based data
  
32,000
   
(6,695
)
  
25,305
 
Other
 
 
530
 
 
 
(482
) 
 
 
48
 
Total
 
$
81,658
 
 
$
(49,867
) 
 
$
31,791