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Leases - Schedule of Cash To Be Received From Future Operating Lease Payments (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Leases [Abstract]  
Remaining 2019 $ 13,193
2020 25,927
2021 31,521
2022 32,467
2023 33,441
2024 34,444
Thereafter 136,535
Total lease payments $ 307,528