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Leases - Future Minimum Payments Under Non-cancellable Lease Obligations (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Leases [Abstract]  
2019 $ 3,929
2020 8,523
2021 7,152
2022 7,369
2023 7,628
Thereafter 22,561
Total lease payments 57,162
Less: imputed interest (10,378)
Total lease liabilities (discounted) $ 46,784