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Accounts Receivable, Net and Revenue Concentrations - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Schedule of Allowance for Doubtful Accounts      
Balance at beginning of period $ 616 $ 478 $ 322
Additions to costs and expenses 299 249 190
(Write-offs)/FX effects (93) (111) (34)
Balance at end of period $ 822 $ 616 $ 478