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Related Party Transactions - Additional information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Jan. 27, 2016
Jul. 31, 2018
Mar. 31, 2020
Mar. 31, 2019
Related Party Transaction [Line Items]        
Research and development expense     $ 18,274,000 $ 12,446,000
License Agreement [Member]        
Related Party Transaction [Line Items]        
Provision for maximum cash payment   $ 2,000,000    
Research and development expense     35,000 232,000
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     $ 360,000 $ 356,000