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For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

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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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Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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Summary of Significant Accounting Policies - Narrative (Details)	12 Months Ended
	Mar. 31, 2022 USD ($) segment	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Number of operating segments \| segment	1
Number of reporting segments \| segment	1
Cash, cash equivalents and marketable securities	$ 434,200,000
Amortization of operating lease right-of-use assets	1,694,000	$ 1,491,000	$ 1,092,000
Restricted cash (included in other assets)	$ 10,100,000	$ 2,987,000	$ 1,374,000
Expected dividend yield	0.00%	0.00%	0.00%
Minimum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Property and equipment useful life	3 years
Maximum
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Property and equipment useful life	7 years
Pfizer
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Share of net profits (as a percent)	50.00%
Sunovion Pharmaceuticals, Inc.
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Restricted cash (included in other assets)	$ 7,100,000	$ 1,000,000
Customer Concentration Risk \| Revenues \| Product revenue, net
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Concentration risk percentage	87.00%	90.00%
Customer Concentration Risk \| Accounts Receivable \| Product revenue, net
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Concentration risk percentage	82.00%	95.00%
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
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Outstanding payment from milestones achieved	3,600,000,000
Richter
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Outstanding payment from milestones achieved	$ 122,500,000