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Commitments and Contingencies - Summary of Maturities of Operating Lease Liabilities (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Three months ending December 31, 2019 $ 1,073  
2020 6,055  
2021 6,097  
2022 6,165  
2023 6,243  
Thereafter 31,946  
Total lease payments 57,579  
Imputed interest (13,976)  
Total 43,603  
Operating lease liabilities - current (included in Accounts payable and accrued liabilities on the Condensed Consolidated Balance Sheet) 2,994  
Operating lease liabilities - long-term 40,609 $ 27,689
Total $ 43,603