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Accounts Receivable and Sales Concentrations (Tables)
 12 Months Ended
Dec. 31, 2017
Receivables [Abstract]  
Summary of Accounts Receivables

Accounts receivable, net, are comprised of the following amounts:

 

     As of December 31,  
     2017      2016  

Trade

    $ 110,165      $ 94,502  

Less - allowance for doubtful accounts

      1,719        1,069  
  

 

 

     

 

 

  

Accounts receivable, net

    $ 108,446      $ 93,433  
  

 

 

     

 

 

  
Summary of Activity in the Allowance for Doubtful Accounts

The following table presents activity in the allowance for doubtful accounts.

 

     Balance at
Beginning
of Year		      Additions      Write-
offs		     Currency
Impacts		     Balance at
End of Year		  

Year Ended December 31, 2017

    $ 1,069      $ 648      $ (101 )    $ 103     $ 1,719  

Year Ended December 31, 2016

    $ 1,055      $ 153      $ (59 )    $ (80 )    $ 1,069  

Year Ended December 31, 2015

    $ 362      $ 729      $ (8 )    $ (28 )    $ 1,055