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Going Concern - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended
Mar. 11, 2019
Apr. 30, 2019
Mar. 31, 2019
Apr. 30, 2018
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]              
Net loss         $ 3,051,840 $ 7,665,617  
Accumulated deficit     $ 32,021,607   32,021,607   $ 28,969,767
Cash and cash equivalents     3,505,026   3,505,026   $ 6,805,889
Cash flow from operations         3,308,484 $ 2,118,887  
Grants receivable       $ 1,900,000      
Reimbursement of grant expenses receivable     161,007   $ 161,007    
Grant [Member]              
Disaggregation of Revenue [Line Items]              
Revenue from grant for notice of award       $ 224,665      
Grant [Member] | National Institutes Of Health [Member] | Eunice Kennedy Shriver National Institute Of Child Health And Human Development [Member] | Second Phase Of Research And Availability Of Funds [Member]              
Disaggregation of Revenue [Line Items]              
Revenue from grant for notice of award $ 982,851   $ 982,851        
Subsequent Event [Member]              
Disaggregation of Revenue [Line Items]              
Aggregate net proceeds on sales of shares of common stock   $ 5,200,000