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Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Remainder of 2019 $ 180  
2020 637  
2021 687  
2022 818  
2023 913  
Thereafter 1,583  
Total lease payments 4,818  
Less imputed interest (939)  
Total $ 3,879 $ 600