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Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Schedule of Allowance for Doubtful Accounts    
Balance at beginning of period $ 904 $ 822
Additions (reductions) to costs and expenses 23 (40)
(Write-offs)/Foreign exchange effects 18 17
Balance at end of period $ 945 $ 799