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Intangible assets, net (Tables)
12 Months Ended
Dec. 31, 2017
Intangible assets, net  
Summary of estimated amortization expense on intangible assets

 

 

 

 

 

2018

    

$

882

 

2019

 

 

730

 

2020

 

 

606

 

2021

 

 

491

 

2022

 

 

363

 

Thereafter

 

 

106