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Grant Award - Additional Information (Detail) - USD ($)		1 Months Ended		3 Months Ended
	Mar. 11, 2019	Mar. 31, 2019	Apr. 30, 2018	Mar. 31, 2019
Accounts, Notes, Loans and Financing Receivable [Line Items]
Grants receivable			$ 1,900,000
Cash received from federal grant				$ 224,665
Reimbursement of grant expenses receivable		$ 161,007		$ 161,007
Grant [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue from grant for notice of award			$ 224,665
Grant [Member] | Eunice Kennedy Shriver National Institute Of Child Health And Human Development [Member] | Second Phase Of Research And Availability Of Funds [Member] | National Institutes Of Health [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue from grant for notice of award	$ 982,851	$ 982,851
Grant [Member] | Eunice Kennedy Shriver National Institute Of Child Health And Human Development [Member] | Remaining Portion Of Research And Availability Of Funds [Member] | National Institutes Of Health [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenue from grant for notice of award	$ 730,722

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