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Leases - Summary of Minimum Lease Payments for Operating Lease Liabilities (Detail)
$ in Thousands
Sep. 30, 2019
USD ($)
Leases [Abstract]  
2019 (3 months remaining) $ 2,142
2020 8,431
2021 9,026
2022 9,302
2023 9,586
Thereafter 77,068
Total operating lease payments 115,555
Less accreted interest (32,914)
Total operating lease liabilities 82,641
Less current operating lease liabilities (8,159)
Noncurrent operating lease liabilities $ 74,482