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Related-Party Transactions (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Accounts Payable      
Related Party Transaction      
Outstanding payments due to consultants $ 42   $ 187
Consultant      
Related Party Transaction      
Expenses paid to consultants $ 636 $ 860