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Accounts Receivable (Details 1) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Accounts Receivable [Line Items]      
Balance at beginning of period $ 432 $ 376 $ 1,179
Less: Reduction in (provision for) allowances (263) (146) 528
Less: Write offs, net of recoveries 92 90 275
Change in foreign currency translation (2) 0 0
Balance at end of period $ 605 $ 432 $ 376