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Leases - Schedule of Maturities Operating Leases (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 $ 334  
2020 615  
2021 620  
2022 634  
2023 655  
Thereafter 1,601  
Total operating lease payments 4,459  
Less imputed interest (1,029)  
Present value of operating lease liabilities $ 3,430 $ 3,458