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Commitments and Contingencies - Future Lease Payments (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]    
2020 $ 0 $ 47
2021 47 47
2022 30 30
2023 30 30
2024 31 31
Thereafter 0 0
Total undiscounted lease payments 138 185
Less: imputed interest (8) (13)
Present value of lease payments $ 130 $ 172