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Accrued Expenses (Tables)
12 Months Ended
Dec. 31, 2017
Accrued Expenses [Abstract]  
Schedule of accrued expenses

  As of December 31, 
  2017  2016 
       
Accrued returns and warranty $35  $11 
Accrued consulting fees and other  142   161 
Total accrued expenses $177  $172