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Commitment and Contingencies - Schedule of Future Minimum Lease Payments on Consolidated Basis Under Company's Facility Financing Lease Obligations (Detail)
$ in Thousands
Dec. 31, 2017
USD ($)
Commitments And Contingencies Disclosure [Abstract]  
2018 $ 14,250
2019 14,466
2020 14,687
2021 14,171
2022 14,335
Thereafter 12,873
Total minimum payments $ 84,782