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Acquisitions - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
May 16, 2018
Apr. 30, 2018
Jul. 19, 2017
Mar. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Business Combination Reverse Merger [Line Items]            
Stock option modification approval date         Mar. 19, 2017  
Goodwill impairment charge       $ 5,200,000 $ 5,187,519 $ 7,500,000
Goodwill     $ 12,700,000     $ 5,187,519
Pear Tree Pharmaceuticals, Inc. [Member]            
Business Combination Reverse Merger [Line Items]            
Business combination completed date May 16, 2018          
Merger Agreement entered date   Apr. 30, 2018        
Potential cash payment to acquire business $ 75,000          
Consideration amount $ 132,000          
Period of potential cash payment 1 year          
Research and Development Expense [Member] | Pear Tree Pharmaceuticals, Inc. [Member]            
Business Combination Reverse Merger [Line Items]            
Transaction costs $ 452,000          
Cerulean/Private Dare Stock Purchase Transaction [Member]            
Business Combination Reverse Merger [Line Items]            
Cash and cash equivalents     9,918,000      
Unamortized fair value of stock options     3,654,000      
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     12,679,000      
Cerulean/Private Dare Stock Purchase Transaction [Member] | General and Administrative Expense [Member]            
Business Combination Reverse Merger [Line Items]            
Transaction costs     $ 960,000      
Private Dare [Member]            
Business Combination Reverse Merger [Line Items]            
Business combination completed date         Jul. 19, 2017  
Stock purchase transaction completion date         Jul. 19, 2017  
Stock purchase agreement date         Mar. 19, 2017