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Accounts Receivable (Details 1) - USD ($) $ in Thousands | 12 Months Ended
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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

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