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Intangible Assets
 6 Months Ended
Jun. 30, 2014
Intangible Assets  
Intangible Assets

5. Intangible Assets

          Intangible assets consisted of the following at December 31, 2012, December 31, 2013 and June 30, 2014 (in thousands):

 
   At December 31, 2012  
 
  
Gross Carrying
Value
 
Accumulated
amortization
 
Net Carrying
Value
 
Weighted
average useful
life in years
 

Acquired technology and domain name

   $ 30,713   $ (4,306 ) $ 26,407     9.75  

Customer relationships

     6,300     (972 )   5,328     8.97  

Tradenames

     4,970     (478 )   4,492     14.80  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 41,983   $ (5,756 ) $ 36,227     10.23  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   


 

 
   At December 31, 2013  
 
  
Gross Carrying
Value
 
Accumulated
amortization
 
Net Carrying
Value
 
Weighted
average useful
life in years
 

Acquired technology and domain name

   $ 30,725   $ (7,624 ) $ 23,101     9.75  

Customer relationships

     6,300     (1,732 )   4,568     8.97  

Tradenames

     4,970     (805 )   4,165     14.80  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 41,995   $ (10,161 ) $ 31,834     10.23  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

 
   At June 30, 2014 (unaudited)  
 
  
Gross Carrying
Value
 
Accumulated
amortization
 
Net Carrying
Value
 
Weighted
average useful
life in years
 

Acquired technology and domain name

   $ 31,075   $ (9,260 ) $ 21,815     9.70  

Customer relationships

     6,300     (2,112 )   4,188     8.97  

Tradenames

     4,900     (898 )   4,002     15.00  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total

   $ 42,275   $ (12,270 ) $ 30,005     10.20  
                   
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                   

          For the six months ended June 30, 2014, the increase in the gross intangible assets balance was due to the purchase of the True.com domain name for $0.4 million (unaudited).

          Amortization expense by asset type for the years ended December 31, 2011, 2012 and 2013 and the six months ended June 30, 2013 and 2014 is shown below (in thousands):

 
   Year Ended
December 31,		   Six Months
Ended
June 30,		  
 
  
2011
 
2012
 
2013
 
2013
 
2014
 
 
    
    
    
   (unaudited)
  

Acquired technology and domain name

   $ 963   $ 3,343   $ 3,318   $ 1,658   $ 1,636  

Customer relationships

     212     760     760     380     380  

Tradenames

     105     373     327     163     163  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​

Total amortization

   $ 1,280   $ 4,476   $ 4,405   $ 2,201   $ 2,179  
                       
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​ ​
                       

          Amortization expense with respect to intangible assets at December 31, 2013 for each of the five years through December 31, 2018 and thereafter is as follows (in thousands):

Years ended December 31,
   
  

2014

     4,183  

2015

     4,061  

2016

     3,968  

2017

     3,789  

2018

     3,788  

Thereafter

     12,045  
       
​ ​ ​ ​ ​

Total amortization expense

   $ 31,834  
       
​ ​ ​ ​ ​
​ ​ ​ ​ ​