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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule of prepaid expense and other current assets    
Prepaid insurance $ 136 $ 125
Prepaid rent 68 46
VAT receivable 336 247
Prepaid inventory 494 715
Advances to suppliers 545 596
Other 257 220
Total prepaid expenses and other current assets $ 1,836 $ 1,949