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Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Schedule of Allowance for Doubtful Accounts    
Balance at beginning of period $ 1,064 $ 904
Additions to costs and expenses 2 167
(Write-offs)/Foreign exchange effects (74) (19)
Balance at end of period $ 992 $ 1,052