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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 |  |  |

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