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Leases - Schedule of Maturities of Lease Liabilities (Detail)
$ in Thousands
Jun. 30, 2019
USD ($)
Finance Leases  
2019 (Remaining six month period) $ 7,002
2020 14,089
2021 13,678
2022 13,878
2023 12,523
Total future lease payments 61,170
Less: Interest (5,319)
Present value of lease liabilities 55,851
Operating Leases  
2019 (Remaining six month period) 313
2020 507
2021 134
2022 19
2023 0
Total future lease payments 973
Less: Interest (36)
Present value of lease liabilities $ 937