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Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2018
Payables and Accruals [Abstract]  
Schedule of accrued expenses

   As of December 31, 
   2018   2017 
         
Accrued returns and warranty  $17   $35 
Accrued consulting fees and other   248    142 
Total accrued expenses  $265   $177