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Related Party Transactions - Additional information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jan. 27, 2016
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Related Party Transaction [Line Items]          
Common stock issued for initial consideration for license       2,300  
Research and development expense related to license agreements   $ 13,042,000 $ 9,232,000 $ 37,755,000 $ 22,286,000
Officers and Board Members [Member] | Consulting Services Agreement [Member]          
Related Party Transaction [Line Items]          
Expense related to related party   0 2,000 0 42,000
License Agreement [Member]          
Related Party Transaction [Line Items]          
Provision for maximum cash payment $ 2,000,000        
Research and development expense related to license agreements   415,000 $ 0 779,000 $ 41,000
License Agreement [Member] | Stock Purchase Agreement [Member]          
Related Party Transaction [Line Items]          
Common stock issued for initial consideration for license 1,161,665        
Sub-lease Agreement [Member] | Officers and Board Members [Member]          
Related Party Transaction [Line Items]          
Expense related to related party   $ 369,000   $ 1,090,000