Common Stock Warrants Outstanding - Additional Information (Detail) - USD ($)	1 Months Ended
	Jan. 31, 2020	Dec. 31, 2019	May 31, 2019	Mar. 31, 2019	Feb. 28, 2019	Mar. 31, 2022	Dec. 31, 2021
Class Of Warrant Or Right [Line Items]
Common stock warrants outstanding, intrinsic value						$ 0	$ 16,000
Warrant [Member] | February 2019 Financing Transaction [Member]
Class Of Warrant Or Right [Line Items]
Class of warrant or rights, expiration date					Feb. 12, 2024
Warrant [Member] | March 2019 Transaction [Member]
Class Of Warrant Or Right [Line Items]
Class of warrant or rights, expiration date				Sep. 19, 2024
Warrant [Member] | May 2019 Inducement Offering [Member]
Class Of Warrant Or Right [Line Items]
Class of warrant or rights, expiration date			Dec. 02, 2024
Warrant [Member] | December 2019 Underwritten Offering [Member]
Class Of Warrant Or Right [Line Items]
Class of warrant or rights, expiration date		Dec. 11, 2024
Warrant [Member] | January 2020 Inducement Offering [Member]
Class Of Warrant Or Right [Line Items]
Class of warrant or rights, expiration date	Jul. 10, 2025