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Commitments and Contingencies - Operating Lease Maturities (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2020 $ 1,037
2021 1,066
2022 1,096
2023 1,127
2024 904
Total lease payments 5,230
Less: imputed interest (761)
Present value of lease liabilities $ 4,469