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Goodwill and intangible assets
12 Months Ended
Dec. 31, 2013
Goodwill and intangible assets  
Goodwill and intangible assets

5. Goodwill and intangible assets

        The changes in carrying amount of goodwill are as follows:

Goodwill, gross, as of December 31, 2011

  $  

Acquisition of BPS

    335,791  

Impact of change in Euro exchange rate

    11,808  

Accumulated impairment losses as of December 31, 2012

     
       

Goodwill, gross, as of December 31, 2012

    347,599  

Impact of change in Euro exchange rate

    14,464  

Accumulated impairment losses as of December 31, 2013

     
       

Goodwill, net, as of December 31, 2013

  $ 362,063  
       
       

        The entire goodwill balance is assigned to the payment processing services segment. As this is the reporting unit expected to benefit from the synergies of the combination.

        Intangible assets are recorded at estimated fair value and are amortized ratably over their estimated useful lives to processing and service costs, which are included in cost of revenue.

        At December 31, the gross book value, accumulated amortization and amortization periods of intangible assets were as follows:

 
  As of December 31, 2013   As of December 31, 2012    
 
 
  Gross book
value
  Accumulated
amortization
  Net book
value
  Gross book
value
  Accumulated
amortization
  Net book
value
  Amortization
period
(in years)
 

Trademarks and patents

  $ 1,100,696   $ (327,200 ) $ 773,496   $ 917,456   $ (258,325 ) $ 659,131     15  

Technology

    3,015,192     (967,779 )   2,047,413     2,894,742     (351,018 )   2,543,724     5  

Customer contracts

    867,354     (867,354 )       867,354     (780,619 )   86,735     5  
                                 

Intangible assets, net

  $ 4,983,242   $ (2,162,333 ) $ 2,820,909   $ 4,679,552   $ (1,389,962 ) $ 3,289,590        
                                 
                                 

        Amortization expense related to intangible assets is as follows:

 
  Year ended December 31,  
 
  2013   2012   2011  

Amortization expense

  $ 735,265   $ 569,721   $ 224,486  

        Intangible amortization expense that will be charged to income for the subsequent five years and thereafter is estimated on the December 31, 2013 book value, as follows:

2014

  $ 677,007  

2015

    675,774  

2016

    675,378  

2017

    309,773  

2018

    70,912  

Thereafter

    412,065  
       

Total

  $ 2,820,909