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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Remaining for year ending December 31, 2019 $ 250  
2020 943  
2021 890  
2022 758  
2023 501  
Thereafter 1,245  
Total lease payments 4,587  
Less: interest (572)  
Total lease liabilities $ 4,015 $ 4,300