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License and Collaboration Agreements - Additional Information (Detail) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
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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 ($) | Aug. 31, 2021 USD ($) | Mar. 31, 2025 USD ($) License | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jan. 31, 2021 USD ($) | Oct. 31, 2020 USD ($)
SYFOVRE [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  |  |  | $ 4,200,000 | $ 4,500,000 |  |  |
Regulatory milestone payments |  | $ 3,000,000 | $ 2,000,000 | $ 2,300,000 |  |  |  |  |  |  |  |  |
Regulatory milestone incurred |  |  |  |  |  |  |  |  |  |  | $ 5,000,000 |  |
Empaveli And Aspaveli [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty expense |  |  |  |  |  |  |  |  | 1,600,000 | 1,600,000 |  |  |
Milestone payments based on annual sales milestones |  | 1,500,000 |  |  |  |  |  |  |  |  |  |  |
Swedish Orphan Biovitrum AB (Publ) [Member] | Aspaveli [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Royalty revenue |  |  |  |  |  |  |  |  | 6,100,000 | 4,500,000 |  |  |
Collaboration and License Agreement [Member] | Swedish Orphan Biovitrum AB (Publ) [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Revenue recognized |  |  |  |  |  |  |  |  | 10,800,000 | 4,800,000 |  |  |
Upfront payment | $ 250,000,000 |  |  |  |  |  |  |  |  |  |  |  |
Milestone payment received for achievement of regulatory development milestone |  |  |  |  |  |  | $ 50,000,000 |  |  |  |  |  |
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 |  |  |
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
Development cost reimbursement |  |  |  |  |  |  |  |  | 80,000,000 |  |  |  |
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 |  |  |  |
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 |  |  |  |
2010 License Agreement [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Aggregate milestones payments |  |  |  |  |  |  |  |  | $ 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 |

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