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Accumulated Other Comprehensive Loss
 12 Months Ended
Dec. 31, 2019
Accumulated Other Comprehensive Loss
12.
Accumulated Other Comprehensive Loss
Changes in accumulated other comprehensive loss consisted of the following for the years ended December 31, 2019 and 2018:
         
 
Foreign
Currency
Translation
Adjustment
 
Balance as of December 31, 2017
  $
(6,363
 )
Other comprehensive loss
   
(5,530
 )
         
Balance as of December 31, 2018
   
(11,893
 )
Other comprehensive loss
   
(3,134
 )
         
Balance as of December 31, 2019
  $
(15,027
 )