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Leases - Reconciliation of the Undiscounted Cash Flows for Each of the First Five Years and Thereafter to Operating Lease Liabilities (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Leases [Abstract]  
2019 (remaining 6 months) $ 2,413
2020 5,111
2021 5,266
2022 4,429
2023 2,358
Thereafter 3,396
Total lease payments 22,973
Less: imputed interest (2,412)
Total lease liabilities $ 20,561