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Going Concern - Additional Information (Detail) - USD ($)
1 Months Ended 6 Months Ended
Mar. 11, 2019
Apr. 30, 2019
Mar. 31, 2019
Apr. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Disaggregation of Revenue [Line Items]              
Accumulated deficit         $ 36,763,651   $ 28,969,767
Cash and cash equivalents         5,630,569   $ 6,805,889
Cash flow from operations         6,326,726 $ 4,807,544  
Grants receivable       $ 1,900,000 456,484    
Reimbursement of grant expenses receivable         456,484    
Aggregate net proceeds on sales of shares of common stock   $ 5,200,000          
Grant              
Disaggregation of Revenue [Line Items]              
Revenue from grant for notice of award       $ 224,665      
Grant | National Institutes Of Health | Eunice Kennedy Shriver National Institute Of Child Health And Human Development | Second Phase Of Research And Availability Of Funds              
Disaggregation of Revenue [Line Items]              
Revenue from grant for notice of award $ 982,851   $ 982,851   $ 161,007