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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Leases [Abstract]    
2019 $ 639  
2020 852  
2021 752  
2022 705  
2023 510  
Thereafter 1,276  
Total lease payments 4,734  
Less: interest (642)  
Total lease liabilities $ 4,092 $ 4,300