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Prepaid Expenses and Other Current Assets
9 Months Ended
Sep. 30, 2021
Prepaid Expenses And Other Current Assets [Abstract]  
Prepaid expenses and other current assets

4. Prepaid Expenses and Other Current Assets

 

Prepaid expenses and other current assets consisted of the following as of September 30, 2021 and December 31, 2020: 

 

   September 30,   December 31, 
(in thousands)  2021   2020 
Australia research and development credit receivable  $1,212   $2,148 
CRO prepayments   693    1,211 
Metals to be used in research and development   1,691    31 
Directors & Officers Insurance   934    
-
 
Other   202    112 
   $4,732   $3,502