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Prepaid Expenses (Tables)
12 Months Ended
Dec. 31, 2021
Prepaid Expenses Disclosure [Abstract]  
Schedule of prepaid expenses
   December 31, 
   2021   2020 
Director, officer and other insurance  $109   $18 
Marketing programs and conferences   66    106 
Patents   41    
-
 
Legal retainer   
-
    25 
Professional service retainer   
-
    8 
Rent   
-
    18 
Engineering, software licenses and other   14    3 
Total prepaid expenses  $230   $178