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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended		6 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Mar. 31, 2022
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 13,265,000	$ 33,791,000	$ 13,265,000	$ 33,791,000	$ 28,675,000
Short-term investments	9,955,000		9,955,000		0
Restricted cash	143,000	111,000	143,000	111,000	143,000
Accumulated deficit	$ (314,275,000)		(314,275,000)		$ (307,739,000)
Cash flow from operations			$ 4,631,000	3,556,000
Issuance of common stock	8,713,268		8,713,268		8,710,627
Dilutive effect	$ 0	$ 0	$ 0	$ 0
Common stock equivalents excluded from computing diluted net loss per share			1,400,000	700,000
At-The-Market Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Issuance of common stock	0		0

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Securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) or earnings per unit (EPU) in the future that were not included in the computation of diluted EPS or EPU because to do so would increase EPS or EPU amounts or decrease loss per share or unit amounts for the period presented.

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Amount of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

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Amount of cash inflow (outflow) from operating activities, including discontinued operations. Operating activity cash flows include transactions, adjustments, and changes in value not defined as investing or financing activities.

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