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Grant Award - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Mar. 11, 2019
Mar. 31, 2019
Apr. 30, 2018
Jun. 30, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Grants receivable     $ 1,900,000 $ 456,484
Cash received from federal grant       224,665
Grant        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Revenue from grant for notice of award     $ 224,665  
Grant | Eunice Kennedy Shriver National Institute Of Child Health And Human Development | Second Phase Of Research And Availability Of Funds | National Institutes Of Health        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Revenue from grant for notice of award $ 982,851 $ 982,851   $ 161,007
Grant | Eunice Kennedy Shriver National Institute Of Child Health And Human Development | Remaining Portion Of Research And Availability Of Funds | National Institutes Of Health        
Accounts, Notes, Loans and Financing Receivable [Line Items]        
Revenue from grant for notice of award $ 730,722