Loan and Security Agreement - Narrative (Details) - 2022 Term Loan - USD ($)		1 Months Ended
	Jul. 26, 2022	Dec. 31, 2022
Debt Instrument [Line Items]
Lenders option to invest in equity financing	$ 10,000,000
Net cash proceeds	75,000,000
Line of Credit
Debt Instrument [Line Items]
Aggregate principal amount (up to)	$ 250,000,000
Capped interest rate per annum	10.25%
Interest-only payment, period	42 months
Covenant revenue from sale, maintained market capitalization	$ 600,000,000
End term charges percentage	4.25%
Prepayment penalty prior first year	2.00%
Prepayment penalty second year	1.50%
Prepayment penalty thereafter	0.75%
Line of Credit | Minimum
Debt Instrument [Line Items]
Qualified Cash percent	50.00%
Line of Credit | Maximum
Debt Instrument [Line Items]
Qualified Cash percent	90.00%
Line of Credit | The Wall Street Journal prime rate
Debt Instrument [Line Items]
Basis spread on variable rate	6.25%
Line of Credit | The Wall Street Journal prime rate | Minimum
Debt Instrument [Line Items]
Basis spread on variable rate	4.00%
Line of Credit | The Wall Street Journal prime rate | Maximum
Debt Instrument [Line Items]
Basis spread on variable rate	8.75%
Line of Credit | On Closing Date
Debt Instrument [Line Items]
Aggregate principal amount (up to)	$ 50,000,000
Line of Credit | Milestone 1 is achieved through December 15, 2022
Debt Instrument [Line Items]
Aggregate principal amount (up to)	50,000,000
Proceeds from Lines of Credit		$ 50,000,000
Line of Credit | Milestone 2 is achieved through September 30, 2023
Debt Instrument [Line Items]
Aggregate principal amount (up to)	25,000,000
Drawn down increments at company's election	5,000,000
Line of Credit | Milestone 3 is achieved
Debt Instrument [Line Items]
Aggregate principal amount (up to)	75,000,000
Drawn down increments at company's election	5,000,000
Line of Credit | Subject to FDA approval of Zimura in GA
Debt Instrument [Line Items]
Aggregate principal amount (up to)	50,000,000
Drawn down increments at company's election	5,000,000
Convertible Notes
Debt Instrument [Line Items]
Aggregate principal amount (up to)	$ 400,000,000
Convertible Notes | Minimum
Debt Instrument [Line Items]
Maturity date no earlier than	6 months
Revolving Credit Facility | Milestone 3 is achieved
Debt Instrument [Line Items]
Aggregate principal amount (up to)	$ 50,000,000