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Commitments and Contingencies - Future Minimum Commitments due Under October 2020 Lease Agreement (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Commitments And Contingencies Disclosure [Abstract]    
Remainder of 2021 $ 64  
2022 88  
2023 90  
2024 93  
2025 96  
Thereafter 125  
Total remaining lease payments 556  
Less: imputed lease interest (106)  
Less: Current portion $ (56)  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Accrued expenses and other liabilities  
Operating lease liability, net of current portion $ 394 $ 409