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Leases - Maturities of Operating Lease Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Jan. 01, 2019
Leases [Abstract]    
Remaining for year ending December 31, 2019 $ 536  
2020 1,013  
2021 941  
2022 768  
2023 510  
Thereafter 1,277  
Total lease payments 5,045  
Less: interest (635)  
Total lease liabilities $ 4,410 $ 4,300