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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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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
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-Section S99
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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
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Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements.

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Amount of amortization expense for right-of-use asset from operating lease.

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-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
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Organization and Summary of Significant Accounting Policies - Narrative (Details)	9 Months Ended
	Dec. 31, 2021 USD ($) segment shares	Dec. 31, 2020 USD ($)	Jan. 26, 2022 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of operating segments \| segment	1
Number of reporting segments \| segment	1
Amortization of operating lease right-of-use assets	$ 1,250,000	$ 1,101,000
Cash, cash equivalents and marketable securities	$ 527,800,000
Sumitomo Dainippon Pharma Co., Ltd. \| Majority Shareholder
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of shares owned (in shares) \| shares	50,041,181
Ownership percentage	53.40%
Sumitomo Dainippon Pharma Co., Ltd. \| Letter Agreement with Sumitomo Dainippon Pharma, Co., Ltd. \| Term Loan \| Majority Shareholder
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Available borrowing capacity	$ 41,300,000
Pfizer \| Subsequent Event
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Outstanding payment from milestones achieved			$ 3,600,000,000
Richter \| Subsequent Event
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Outstanding payment from milestones achieved			$ 122,500,000