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Leases - Schedule of Cash To Be Received From Future Operating Lease Payments (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Leases [Abstract]  
Remaining 2019 $ 9,599
2020 25,909
2021 31,502
2022 32,447
2023 33,421
2024 34,423
Thereafter 136,372
Total lease payments $ 303,673