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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($)	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023
Summary Of Significant Accounting Policies [Line Items]
Cash and cash equivalents	$ 10,754,000	$ 15,568,000	$ 15,301,000
Restricted cash	143,000	143,000	143,000
Accumulated deficit	(329,026,000)		$ (324,998,000)
Cash flow from operations	$ 5,311,000	2,414,000
Issuance of common stock	8,718,203		8,716,906
Dilutive effect	$ 0	$ 0
Common stock equivalents excluded from computing diluted net loss per share	1,700,000	2,000,000
At-The-Market Facility [Member]
Summary Of Significant Accounting Policies [Line Items]
Issuance of common stock	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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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Amount of increase (decrease) to net income used for calculating diluted earnings per share (EPS), resulting from the assumed exercise stock options, restrictive stock units (RSUs), convertible preferred stock of an employee stock ownership plan (ESOP), and other dilutive convertible securities.

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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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