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Commitments and Contingencies - Summary of Maturity of Lease Liabilities for Operating and Finance Leases (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jan. 01, 2019
Dec. 31, 2018
Operating Leases      
2019 $ 1,003    
2020 3,892    
2021 4,236    
2022 4,389    
2023 3,574    
Thereafter 18,067    
Total lease payments 35,161    
Less: imputed interest 9,851    
Total lease liabilities 25,310 $ 24,000  
Current lease liabilities 1,925    
Long-term lease liabilities 23,385    
Finance Leases      
2019 72    
2020 214    
2021 2    
Total lease payments 288    
Less: imputed interest 10    
Total lease liabilities 278    
Current lease liabilities 258   $ 266
Long-term lease liabilities $ 20   $ 210