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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Schedule of prepaid expense and other current assets    
Prepaid insurance $ 168 $ 136
Prepaid rent 41 68
VAT receivable 176 336
Prepaid inventory 120 494
Advances to suppliers 155 545
Other 230 257
Total prepaid expenses and other current assets $ 890 $ 1,836