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Goodwill (Tables)
12 Months Ended
Dec. 31, 2018
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of changes in the carrying amount of goodwill
   IT
professional
services
   Software
services
   Total 
             
As of January 1, 2017  $43,874   $47,128   $91,002 
                
Business combination   1,723    -    1,723 
Measurement period adjustments   614    28    642 
Foreign currency translation adjustments   2,192    2,630    4,822 
                
As of December 31, 2017  $48,403   $49,786   $98,189 
                
Business combination   -    277    277 
Measurement period adjustments   (18)   -    (18)
Foreign currency translation adjustments   (1,694)   (1,748)   (3,442)
                
As of December 31, 2018  $46,691   $48,315   $95,006