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Leases - Cost (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Leases    
Total Lease Cost $ 230 $ 243
Research and Development Expense    
Leases    
Fixed lease cost 176 176
Amortization of lease assets 30 38
General and Administrative Expense    
Leases    
Fixed lease cost 19 19
Interest Expense    
Leases    
Interest on lease liabilities $ 5 $ 10