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Prepaid Expenses (Tables)
12 Months Ended
Dec. 31, 2019
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Schedule of prepaid expenses
   December 31, 
   2019   2018 
Director compensation  $9   $100 
Director, officer and other insurance   115    121 
Marketing programs and conferences   80    53 
Legal retainer   25    25 
Professional service retainer   8    8 
Rent   11    19 
Equipment service deposits   1    3 
Engineering, software licenses and other   8    13 
Total prepaid expenses  $257   $342