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Prepaid Expenses and Other Current Assets (Tables)
 12 Months Ended
Dec. 31, 2021
Prepaid Expenses and Other Current Assets [Abstract]  
Schedule of prepaid expenses and other current assets
   December 31, 
   2021   2020 
Prepaid insurance   279    292 
Prepaid research and development   684    209 
Prepaid software   79    10 
Accrued interest on marketable debt securities   634    
-
 
Prepaid rent   
-
    113 
Other prepaid expenses   173    111 
Other current assets   34    52 
Total  $1,883   $787