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Long-term Debt - Financing Agreement and Credit Facility - Additional Information (Details) - USD ($) |  | 9 Months Ended
--- | --- | ---
May 13, 2024 | Sep. 30, 2025 | Sep. 30, 2024
Debt Instrument [Line Items] |  |  |
Proceeds from credit facility |  |  | $ 365,454,000
SYFOVRE [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Minimum required sales to draw additional loan under credit facility | $ 180,000,000 |  |
Sixth Street Financing Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Proceeds from initial draw amount under credit facility | 358,200,000 |  |
Proceeds from net of isuance cost | 16,800,000 |  |
Proceeds from credit facility | 326,500,000 |  |
Senior Secured Credit Facility [Member] | Asset-Based Financing Arrangement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Available additional draw amount upon satisfaction of cash requirements | 100,000,000 |  |
Senior Secured Credit Facility [Member] | Sixth Street Financing Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Maximum borrowing capacity | 475,000,000 |  |
Available initial draw amount under credit facility | 375,000,000 |  |
Available additional draw amount upon satisfaction of cash requirements | 100,000,000 | $ 0 |
Minimum cash requirements to draw additional loan under credit facility | 50,000,000 |  |
Minimum required sales to draw additional loan under credit facility | $ 100,000,000 |  |
Credit facility maturity date | May 13, 2030 |  |
Debt instrument, covenant description |  | The Sixth Street Financing Agreement contains customary covenants, including, without limitation, a financial covenant to maintain liquidity of at least $50.0 million if the Company’s market capitalization is below $3.0 billion, and negative covenants that, subject to certain exceptions, restrict indebtedness, liens, investments (including acquisitions), fundamental changes, asset sales and licensing transactions, dividends, modifications to material agreements, payment of subordinated indebtedness, and other matters customarily restricted in such agreements. Among other permissions, the Company is permitted, on terms and conditions set forth on the Sixth Street Financing Agreement, to enter into a separate asset-based financing arrangement with a third party in an amount of up to $100.0 million, which amount is increased to $200.0 million upon certain sales or market capitalization thresholds, and to have outstanding convertible unsecured notes in an amount equal to the greater of $400.0 million and 10% of the Company’s market capitalization, but not to exceed $600.0 million. The Company is subject to restrictions on sales and licensing transactions with respect to its core intellectual property, defined to include SYFOVRE, EMPAVELI, and other pegcetacoplan product assets, subject to certain exceptions, including certain transactions related to areas outside the United States and Europe. |
Minimum required financial covenant if capitalization below three billion | $ 50,000,000 |  |
Market capitalization threshold percentage for credit facility | 10.00% |  |
Senior Secured Credit Facility [Member] | Sixth Street Financing Agreement [Member] | Asset-Based Financing Arrangement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Revised Additional Available Draw Amount Upon Satisfaction of Sales or Market capitalization | $ 200,000,000 |  |
Minimum required convertible unsecured notes for additional loan amount | 400,000,000 |  |
Market capitalization threshold for credit facility | $ 600,000,000 |  |
Senior Secured Credit Facility [Member] | Sixth Street Financing Agreement [Member] | SOFR [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Variable interest rate percentage on base rate | 1.00% |  |
Credit Facility [Member] | Sixth Street Financing Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument effective interest rate | 5.75% |  |
Credit Facility [Member] | Maximum [Member] | Sixth Street Financing Agreement [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Percentage of prepayment premium | 3.00% |  |

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