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Capitalized Software (Tables)
 9 Months Ended
Sep. 30, 2016
Research and Development [Abstract]  
Capitalized Software
Capitalized software consisted of the following:
 
 
September 30,
 
December 31,
 
 
2016
 
2015
 
 
(In thousands)
Capitalized internal-use software development costs
 
$
164,669

 
$
146,261

Less: Accumulated amortization
 
(112,759
)
 
(99,625
)
Capitalized software, net
 
$
51,910

 
$
46,636


Amortization expense is classified in each of the operating expense categories as follows:
 
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
  
 
2016
 
2015
 
2016
 
2015
 
 
(In thousands)
Cost of revenue
 
$
4,175

 
$
4,625

 
$
12,774

 
$
14,224

Sales and marketing
 
59

 
51

 
163

 
117

General and administrative
 
97

 
122

 
328

 
367

Total
 
$
4,331

 
$
4,798

 
$
13,265

 
$
14,708