Summary of Significant Accounting Policies (Details)	12 Months Ended
	Mar. 31, 2023 USD ($) segment shares	Mar. 31, 2022 USD ($) shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Restricted cash	$ 600,000	$ 600,000
Restricted cash in current asset	500,000	500,000
Restricted cash in noncurrent asset	100,000	100,000
Cash and cash equivalents	15,527,000	33,435,000
Provision for doubtful accounts	0	0
Goodwill impairment charges	0	0
Impairment of intangible assets	0	0
Grant reimbursement	$ 600,000	$ 300,000
Number of anti-dilutive shares (in shares) | shares	7,049,192	6,491,081
Number of reportable segments | segment	1
Revenue from product and license fees	$ 16,511,000	$ 24,050,000
Stock options
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of anti-dilutive shares (in shares) | shares	2,909,204	2,879,008
RSU
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of anti-dilutive shares (in shares) | shares	816,022	954,775
Warrant
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of anti-dilutive shares (in shares) | shares	3,323,966	2,657,298
Minimum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life (in years)	3 years
Estimated useful life of intangible assets (in years)	3 years
Award vesting period (in years)	1 year
Maximum
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Estimated useful life (in years)	7 years
Estimated useful life of intangible assets (in years)	10 years
Award vesting period (in years)	4 years
Japan
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cash and cash equivalents	$ 200,000	$ 100,000
Cash and cash equivalents in foreign subsidiary (as a percent)	1.00%	0.20%
Revenue from product and license fees		$ 700,000
U.S.
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Revenue from product and license fees		$ 23,400,000