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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