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Commitments and Contingencies - Summary of Future Minimum Annual Lease Payments under Operating and Financing Leases (Details) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Operating Leases    
Remaining 2021 $ 44  
2022 154  
2023 131  
2024 114  
2025 108  
Thereafter 234  
Total minimum lease payments 785  
Less: amount representing interest (175)  
Present value of obligations under leases 610  
Less: current portion (106) $ (123)
Noncurrent operating lease liability $ 504 $ 528