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Leases - Maturities of Operating Lease Liabilities (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Leases [Abstract]  
2019 (excluding the nine months ended September 30, 2019) $ 386
2020 1,561
2021 1,528
2022 1,552
2023 196
Thereafter 0
Total lease payments 5,223
Less: imputed interest (870)
Operating lease liability $ 4,353