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Commitments and Contingencies - Summary of Maturity of Lease Liabilities for Operating and Finance Leases (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Lease      
2019 $ 2,390    
2020 3,270    
2021 3,369    
2022 3,470    
2023 3,574    
Thereafter 18,067    
Total lease payments 34,140    
Less: imputed interest 10,449    
Total lease liabilities 23,691 $ 24,000  
Current lease liabilities 1,374    
Long-term lease liabilities 22,317    
Finance Leases      
2019 215    
2020 214    
2021 2    
Total lease payments 431    
Less: imputed interest 21    
Total lease liabilities 410    
Current lease liabilities 269   $ 266
Long-term lease liabilities $ 141   $ 210