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Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Schedule of Allowance for Doubtful Accounts    
Balance at beginning of period $ 1,121 $ 1,064
Additions to costs and expenses 3 4
(Write-offs)/Foreign exchange effects (4) 9
Balance at end of period $ 1,120 $ 1,077