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Prepaid Expenses (Tables)
9 Months Ended
Sep. 30, 2021
Prepaid Expenses Disclosure [Abstract]  
Schedule of prepaid expenses
   September 30,   December 31, 
   2021   2020 
Director, officer and other insurance  $192   $18 
NASDAQ fees   15    
-
 
Legal retainer   25    25 
Marketing programs and conferences   300    106 
Professional services retainer   13    8 
Rent   -    18 
Engineering, software licenses and other   36    3 
Total prepaid expenses  $581   $178