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Commitments and Contingencies - Summary of Future Minimum Lease Payments (Detail) - Building Lease Agreement [Member] - USD ($)
$ in Thousands
Sep. 30, 2017
Jul. 24, 2017
Operating Leased Assets [Line Items]    
2018 $ 416  
2019 1,510  
2020 1,819  
2021 1,875  
2022 1,833  
Thereafter 3,137  
Minimum Annual Lease Payments $ 10,590 $ 9,317