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Acquisitions - Additional Information (Detail) - USD ($)				3 Months Ended		12 Months Ended
	May 16, 2018	Apr. 30, 2018	Jul. 19, 2017	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Business Combination Reverse Merger [Line Items]
Cash and cash equivalents			$ 9,918,000
Unamortized fair value of stock options			3,654,000
Stock option modification approval date				Mar. 19, 2017
Total purchase price consideration			24,279,000
Purchase price adjustments increase in current liabilities			23,609
Purchase price adjustments increase in current assets			225,778
Original goodwill amount acquired			12,900,000
Reduced original goodwill			202,169
Goodwill impairment charge				$ 0	$ 5,187,519	$ 7,500,000
Goodwill			12,679,000			$ 5,200,000
Pear Tree Pharmaceuticals, Inc. [Member]
Business Combination Reverse Merger [Line Items]
Merger Agreement entered date		Apr. 30, 2018
Business combination completed date	May 16, 2018
Consideration amount	$ 132,000
Potential cash payments to acquire business	75,000
General and Administrative Expense [Member]
Business Combination Reverse Merger [Line Items]
Transaction costs			$ 960,000
Research and Development Expense [Member] | Pear Tree Pharmaceuticals, Inc. [Member]
Business Combination Reverse Merger [Line Items]
Transaction costs	$ 452,000
Private Dare [Member]
Business Combination Reverse Merger [Line Items]
Stock purchase transaction completion date				Jul. 19, 2017
Stock purchase agreement date				Mar. 19, 2017
Business combination completed date				Jul. 19, 2017

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