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License and Collaboration Agreements - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended | 41 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Nov. 30, 2020 USD ($) | Jan. 31, 2024 USD ($) | Oct. 31, 2023 USD ($) | Apr. 30, 2023 USD ($) | Jan. 31, 2023 USD ($) | Jun. 30, 2022 USD ($) | Apr. 30, 2022 USD ($) | Aug. 31, 2021 USD ($) | Jun. 30, 2021 Program | Mar. 31, 2024 USD ($) License | Mar. 31, 2023 USD ($) | Dec. 31, 2023 USD ($) | Mar. 31, 2024 USD ($) License | Jul. 31, 2021 USD ($) | Jan. 31, 2021 USD ($) | Oct. 31, 2020 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development cost reimbursement received |  | $ 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | $ 172,325,000 | $ 44,846,000 |  |  |  |  |
Accrued expenses |  |  |  |  |  |  |  |  |  | 101,399,000 |  | $ 127,806,000 | $ 101,399,000 |  |  |
EMPAVELI [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 25,610,000 | 20,440,000 |  |  |  |  |
SYFOVRE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  | 137,465,000 | 18,360,000 |  |  |  |  |
Regulatory milestone payments |  | 3,000,000 | $ 2,000,000 | $ 2,300,000 |  |  |  |  |  |  |  |  |  |  |  |
Regulatory milestone incurred |  |  |  |  |  |  |  |  |  |  |  | 5,000,000 |  |  |  |
Royalty expense incurred |  |  |  |  |  |  |  |  |  | 13,400,000 |  |  | 13,400,000 |  |  |
Empaveli And Aspaveli [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments based on annual sales milestones |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty expense incurred |  |  |  |  |  |  |  |  |  | 9,500,000 |  |  | 9,500,000 |  |  |
Swedish Orphan Biovitrum AB (Publ) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty revenue |  |  |  |  |  |  |  |  |  | 4,500,000 | 1,600,000 |  |  |  |  |
Collaboration and License Agreement [Member] | Swedish Orphan Biovitrum AB (Publ) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Upfront payment | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received for achievement of regulatory development milestone |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |  |  |  |
Development cost reimbursement |  |  |  |  |  |  |  |  |  | 80,000,000 |  |  |  |  |  |
Development cost reimbursement received |  |  |  |  |  |  |  |  |  | 65,000,000 |  |  |  |  |  |
Waived Payment |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |  |  |
Royalties entitled to receive after first commercial sale of applicable licensed product period |  |  |  |  |  |  |  |  |  | 10 years |  |  |  |  |  |
Contract research and development expense |  |  |  |  |  |  |  |  |  | $ 0 | $ 0 |  | 65,000,000 |  |  |
Contract research and development current |  |  |  |  |  |  |  |  |  |  |  | $ 15,000,000 |  |  |  |
Remaining reimbursement payment |  | 15,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration and License Agreement [Member] | Swedish Orphan Biovitrum AB (Publ) [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate milestone payments upon achievement of specified one time regulatory development and commercial milestone events |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 915,000,000
University of Pennsylvania [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Development milestone achievement |  |  |  |  |  | $ 5,000,000 |  | $ 1,000,000 |  |  |  |  |  |  |  |
University of Pennsylvania [Member] | Empaveli And Aspaveli [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Milestone payments based on annual sales milestones |  |  |  |  | $ 1,000,000 |  |  |  |  |  |  |  |  |  |  |
University of Pennsylvania [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate milestones payments |  |  |  |  |  |  |  |  |  | 3,200,000 |  |  | $ 3,200,000 |  |  |
Milestone payments based on annual sales milestones |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |  |  |  |  |
2010 License Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of licensed products | License |  |  |  |  |  |  |  |  |  | 2 |  |  | 2 |  |  |
2010 License Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate milestones payments |  |  |  |  |  |  |  |  |  | $ 1,700,000 |  |  | $ 1,700,000 |  |  |
Milestone payments based on annual sales milestones |  |  |  |  |  |  |  |  |  | $ 2,500,000 |  |  |  |  |  |
Sobi Agreement and Another Licensing Transaction [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Sublicense fee owed |  | $ 500,000 |  |  |  |  |  |  |  |  |  |  |  |  | $ 25,000,000 |
Research Collaboration Agreement [Member] | Beam [Member] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Collaboration agreement term |  |  |  |  |  |  |  |  | 5 years |  |  |  |  |  |  |
Number of research programs | Program |  |  |  |  |  |  |  |  | 6 |  |  |  |  |  |  |
Up-front non-refundable payment |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 50,000,000 |  |
Up-front payment on first anniversary of agreement on June 30, 2022 |  |  |  |  |  | $ 25,000,000 |  |  |  |  |  |  |  |  |  |
Collaboration agreement maximum extendable term |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |

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