Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Nature of Business - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Thousands							6 Months Ended
	Jul. 08, 2022	Jul. 05, 2022	Mar. 25, 2021	Mar. 17, 2021	Mar. 01, 2021	Mar. 10, 2020	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021	Mar. 31, 2020
Description Of Business [Line Items]
Number of common shares sold	1,575,000
Net proceeds from issuance	$ 26,800						$ 0	$ 28,119
Accumulated deficit							(157,604)		$ (138,966)
Cash, cash equivalents and marketable securities							54,400
Follow-on Public Offering [Member]
Description Of Business [Line Items]
Number of common shares sold		12,000,000	2,033,899
Share price		$ 2.10	$ 14.75
Net proceeds from issuance			$ 28,100
Cash, cash equivalents and marketable securities							$ 26,800
Torii Agreement [Member] \| Torii [Member]
Description Of Business [Line Items]
Obligated to make upfront payment				$ 11,500
Mezzanine Loan Agreement [Member] \| Mezzanine Lenders [Member] \| Term A Loan [Member]
Description Of Business [Line Items]
Line of credit										$ 35,000
Borrowed amount						$ 35,000
Mezzanine Loan Agreement [Member] \| Mezzanine Lenders [Member] \| Term B1 Loan [Member]
Description Of Business [Line Items]
Borrowed amount					$ 5,000