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Commitments and Contingencies - Future Minimum Lease Payments under Noncancelable Operating Leases (Detail)
$ in Thousands
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2017 $ 4,822
2018 5,241
2019 5,254
2020 5,398
2021 5,551
Thereafter 25,035
Total $ 51,301