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Leases - Maturity of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Jan. 01, 2019
Leases [Abstract]    
2021 (six months remaining) $ 234  
2022 257  
2023 236  
2024 247  
2025 276  
2026 115  
Total lease payments 1,365  
Less imputed interest (245)  
Present value of operating lease liabilities $ 1,120 $ 1,090