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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]  
Schedule of prepaid expense and other current assets
  As of December 31, 
   2018   2017 
         
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