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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
Mar. 31, 2019
USD ($)
Leases [Abstract]  
2019 (remaining 9 months) $ 3,424
2020 5,121
2021 5,276
2022 4,435
2023 2,358
Thereafter 3,394
Total lease payments 24,008
Less: imputed interest (2,726)
Total lease liabilities $ 21,282