Reimbursement of grant expenses receivable.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Carrying amount as of the balance sheet date of amounts due under the terms of governmental, corporate, or foundation grants.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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The cash inflow from the additional capital contribution to the entity.

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The cumulative amount of the reporting entity's undistributed earnings or deficit.

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Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

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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