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Prepaid Expenses (Tables)
6 Months Ended
Jun. 30, 2021
Prepaid Expenses Disclosure [Abstract]  
Schedule of prepaid expenses
   June 30,   December 31, 
   2021   2020 
Director, officer and other insurance  $211   $18 
NASDAQ fees   22    
-
 
Legal retainer   25    25 
Marketing programs and conferences   52    106 
Professional services retainer   13    8 
Rent   18    18 
Engineering, software licenses and other   40    3 
Total prepaid expenses  $381   $178