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v3.19.1

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 |  |  |  |  |

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