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Leases - Additional Information (Details)			3 Months Ended		6 Months Ended
	Nov. 17, 2021 ft²	Nov. 23, 2020 USD ($) ft²	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Mar. 31, 2023 USD ($)	Dec. 17, 2021 USD ($)
Operating Lease [Line Items]
Operating lease, liability			$ 1,604,000		$ 1,604,000			$ 2,300,000
Operating lease right-of-use assets			1,505,000		1,505,000		$ 1,705,000	$ 2,300,000
Variable lease expense			39,000	$ 41,000	75,000	$ 76,000
Operating Lease, Expense			126,000	129,000	252,000	258,000
Operating cash flows from operating leases			$ 126,000	$ 122,000	$ 252,000	$ 245,000
San Diego Permanent Lease [Member]
Operating Lease [Line Items]
Lab and Office space under lease agreement | ft²	2,892	8,051
Lease term		62 months
Monthly rental payments		$ 40,800
Base rent escalators		3.00%

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Lab and office space area under lease agreement.

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Operating lease.

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Operating leases monthly rent expense.

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- Definition

Discount rate used by lessee to determine present value of operating lease payments.

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Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of operating lease expense. Excludes sublease income.

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Present value of lessee's discounted obligation for lease payments from operating lease.

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Amount of cash outflow from operating lease, excluding payments to bring another asset to condition and location necessary for its intended use.

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Amount of lessee's right to use underlying asset under operating lease.

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Amount of variable lease cost, excluded from lease liability, recognized when obligation for payment is incurred for finance and operating leases.

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