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Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Thousands, shares in Millions	1 Months Ended				3 Months Ended				12 Months Ended
	Jan. 31, 2022	Aug. 31, 2020	Mar. 31, 2020	Aug. 31, 2018	Mar. 31, 2022	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Dec. 31, 2018	Dec. 31, 2021	Dec. 31, 2020
Other Commitments [Line Items]
Gain (loss) on strategic investment					$ 339	$ 145
Research and development					128,855	56,973
Restricted cash					5,770	$ 5,770				$ 5,770	$ 5,770
Letter of Credit | Corporate Credit Card Program
Other Commitments [Line Items]
Restricted cash					2,000
Letter of Credit | Fleet Program
Other Commitments [Line Items]
Restricted cash					400
Cersci Therapeutics
Other Commitments [Line Items]
Upfront consideration and transaction costs		$ 52,800
Upfront payment		$ 44,300
Upfront payment conditions		The Company incurred an aggregate of $52.8 million in upfront consideration and transaction costs, of which, $44.3 million was paid through the issuance of approximately 1.2 million shares of the Company’s common stock.
Cersci Therapeutics | Research And Development Expense Member
Other Commitments [Line Items]
Assets acquisition and upfront payment							$ 45,700
Stoke Therapeutics, Inc. [Member]
Other Commitments [Line Items]
Upfront payment	$ 60,000
Mile stone payments payable	$ 907,500
License Agreements | Neuren | North America
Other Commitments [Line Items]
Upfront payment			$ 10,000
Upfront license fee				$ 10,000
License Agreements | Neuren | Research And Development Expense Member | North America
Other Commitments [Line Items]
Upfront payment								$ 10,000	$ 10,000
Maximum
Other Commitments [Line Items]
Mile stone payments payable					$ 3,100,000
Maximum | Cersci Therapeutics
Other Commitments [Line Items]
Common stock issuance		1.2
Maximum | Cersci Therapeutics | Development Commercialization and Sales Milestones
Other Commitments [Line Items]
Compensation expense related to mergers to former holders		$ 887,000
Maximum | License Agreements | Neuren | North America
Other Commitments [Line Items]
Mile stone payments payable			$ 515,000	$ 455,000				$ 515,000

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