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Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Schedule of Allowance for Doubtful Accounts    
Balance at beginning of period $ 822 $ 616
Additions (reductions) to costs and expenses 123 189
(Write-offs)/Foreign exchange effects 15 (77)
Balance at end of period $ 960 $ 728