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Leases - Summary of Future Minimum Lease Payments under Operating Leases (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Lessee Disclosure [Abstract]  
2019 (excluding the nine-months ended September 30, 2019) $ 885
2020 3,067
2021 2,839
2022 2,820
2023 2,726
Thereafter 22,791
Total undiscounted lease payments 35,128
Less: imputed interest 18,007
Operating lease, liability $ 17,121