Stockholders' Equity - Schedule of Warrants to Purchase Common Stock Outstanding (Detail) - $ / shares	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Class Of Warrant Or Right [Line Items]
Warrants Outstanding	3,104,318	8,937,651	4,499,603
Class Of Warrant Or Right Issued on December 2015 [Member] | Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Issued	2015-12
Classification	Equity
Warrants Outstanding	446,500
Exercise Price	$ 5.00
Expiration	2025-12
Class Of Warrant Or Right Issued on February 2016 [Member] | Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Issued	2016-02
Classification	Equity
Warrants Outstanding	461,384
Exercise Price	$ 5.00
Expiration	2026-02
Class Of Warrant Or Right Issued on July 2016 [Member] | Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Issued	2016-07
Classification	Equity
Warrants Outstanding	29,767
Exercise Price	$ 5.00
Expiration	2026-06
Class Of Warrant Or Right Issued on April 2019 [Member] | Common Stock [Member]
Class Of Warrant Or Right [Line Items]
Issued	2019-04
Classification	Liability
Warrants Outstanding	2,166,667
Exercise Price	$ 1.80
Expiration	2024-04