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Acquisitions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
May 16, 2018
Jul. 19, 2017
Jun. 30, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Business Combination Reverse Merger [Line Items]              
Cash and cash equivalents   $ 9,900,000          
Unamortized fair value of stock options   $ 3,700,000          
Goodwill impairment charge     $ 0 $ 0 $ 5,200,000 $ 0 $ 5,187,519
Pear Tree Pharmaceuticals, Inc.              
Business Combination Reverse Merger [Line Items]              
Potential cash payments to acquire business $ 75,000            
Consideration amount 132,000            
Research and Development Expense | Pear Tree Pharmaceuticals, Inc.              
Business Combination Reverse Merger [Line Items]              
Transaction costs $ 452,000