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Commitments and Contingencies - Summary of Maturities of Operating Lease Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]    
Nine months ending December 31, 2019 $ 2,135  
2020 6,065  
2021 6,107  
2022 6,175  
2023 6,253  
Thereafter 31,969  
Total lease payments 58,704  
Imputed interest (14,669)  
Total 44,035  
Operating lease liabilities - current (included in Accounts payable and accrued liabilities on the Condensed Consolidated Balance Sheet) 2,485  
Operating lease liabilities - long-term 41,550 $ 27,689
Total $ 44,035