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Leases - Schedule of Operating Lease Maturity (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Leases [Abstract]    
2019 (remaining six months) $ 984  
2020 2,027  
2021 2,050  
2022 2,072  
2023 2,093  
2024 2,115  
Thereafter 68,906  
Total lease payments 80,247  
Less: Imputed interest (56,325)  
Present value of lease liabilities $ 23,922 $ 25,715