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Leases - Maturities of Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Remainder of 2019 $ 118  
2020 150  
2021 97  
2022 39  
2023 0  
Thereafter 0  
Total lease payments 404  
Less imputed interest (29)  
Total $ 375 $ 600