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Prepaid Expenses and Other Current Assets (Tables)
12 Months Ended
Dec. 31, 2021
Disclosure Text Block Supplement [Abstract]  
Schedule of prepaid expenses and other current assets
   December 31,   December 31, 
   2021   2020 
Prepaid insurance  $874   $792 
Prepaid clinical trial expenses   543    457 
Other prepaid expenses and other current assets   61    68 
Total prepaid expenses and other current assets  $1,478   $1,317