Acquisitions - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended	12 Months Ended
	May 16, 2018	Jul. 18, 2017	May 31, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Nov. 30, 2019	Nov. 20, 2019	Jul. 19, 2017
Business Combination Reverse Merger [Line Items]
Cash and cash equivalents									$ 9,900,000
Unamortized fair value of Cerulean stock options		$ 3,700,000
Goodwill impairment charge				$ 5,200,000	$ 0	$ 5,187,519
Equity issued in consideration of acquisition					$ 2,369,992	$ 0
Common stock issued to Microchips capital stock holders (in shares)					2,999,990
Reverse stock split					1-for-10
Common stock, par value					$ 0.0001	$ 0.0001
Common stock, shares issued					19,683,401	11,422,161
Pear Tree Pharmaceuticals Inc.
Business Combination Reverse Merger [Line Items]
Equity issued in consideration of acquisition	$ 132,000
Potential cash payment to acquire business	$ 75,000
Pear Tree Pharmaceuticals Inc. | Research and Development Expense
Business Combination Reverse Merger [Line Items]
Transaction costs			$ 452,000
Microchips Biotech, Inc.
Business Combination Reverse Merger [Line Items]
Cash and cash equivalents							$ 6,100,000
Business acquisition transaction value							$ 2,400,000
Business combination shares issued (dollars per share)							$ 0.79
Contingent consideration, liability							$ 3,500,000
Contingent consideration							1,000,000	$ 1,000,000
Microchips Biotech, Inc. | Research and Development Expense
Business Combination Reverse Merger [Line Items]
Business acquisition transaction value							$ 202,000