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Accrued and Other Liabilities (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Payables And Accruals [Abstract]    
Commercial related $ 7,203 $ 1,694
Deferred rent 960 879
Current portion of long term obligation to collaborator 880  
Others 2,473 979
Total accrued and other liabilities $ 11,516 $ 3,552