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Leases - Schedule of Future Sublease Income Term (Detail)
$ in Thousands
Mar. 31, 2019
USD ($)
Leases [Abstract]  
2019 (9 months remaining) $ 1,816
2020 2,479
2021 2,544
2022 2,611
2023 2,680
Thereafter 2,284
Total $ 14,414