Sales of Equity Securities - Additional Information (Detail) - USD ($)		1 Months Ended			3 Months Ended		12 Months Ended
	May 12, 2021	Jan. 31, 2020	Mar. 31, 2019	Feb. 28, 2019	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021	Jan. 31, 2018
Class Of Stock [Line Items]
Proceeds from exercise of common stock warrants						$ 18,000
Fair value of warrants issued		$ 1,900,000
Warrant inducement expense			$ 130,000	$ 60,000			$ 2,100,000
Sales Agreement [Member] | Sales Agent [Member]
Class Of Stock [Line Items]
Stock price							$ 4.31
Shares issued in offering							3,428,680
Number of days prior notice to terminate sales agreement	10 days
Percentage of fixed commission to sales agent rate equal to gross sales price per share of common stock sold under sales agreement	3.00%
Net cash proceeds from sale of securities							$ 14,100,000
Common stock remained available for sale					$ 10,200,000
Maximum [Member] | Sales Agreement [Member] | Sales Agent [Member]
Class Of Stock [Line Items]
Shares issued in offering	25,000,000
Warrant [Member]
Class Of Stock [Line Items]
Issuance of warrants to purchase shares of common stock								89,657
Stock price		$ 3.495						$ 4.05
Over-allotment Option [Member] | Warrant [Member]
Class Of Stock [Line Items]
Proceeds from exercise of common stock warrants		$ 700,000
Shares issued in offering		192,750
February 2019 March 2019 Warrant Repricing and Exchange Transaction [Member]
Class Of Stock [Line Items]
Proceeds from exercise of common stock warrants		$ 2,300,000
Number of warrants issued under warrant repricing and exchange transaction		692,725
Warrant inducement expense		$ 191,000
February 2019 March 2019 Warrant Repricing and Exchange Transaction [Member] | Warrant [Member]
Class Of Stock [Line Items]
Issuance of warrants to purchase shares of common stock		692,725