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Leases - Summary of future minimum lease payments (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Lessee Disclosure [Abstract]    
Remainder $ 1,832 $ 1,948
2019   3,764
2020 3,676 3,516
2021 2,958 3,146
2022 2,958 2,958
2023 2,958 20,599
2024 17,641  
Total future minimum lease payments (undiscounted) $ 32,023 $ 35,931