Summary of Significant Accounting Policies (Details)				1 Months Ended			3 Months Ended		9 Months Ended
	Oct. 11, 2024 USD ($)	Jul. 19, 2024 USD ($)	Apr. 30, 2020 USD ($)	Sep. 30, 2023 USD ($) $ / shares shares	Nov. 30, 2022 USD ($)	Apr. 30, 2020 USD ($)	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) $ / shares shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2023 USD ($) $ / shares shares	Dec. 31, 2023 USD ($) shares	Dec. 31, 2022 USD ($)
Policies
Net Income (Loss)							$ (31,592,000)	$ (109,030,000)	$ (136,655,000)	$ (356,770,000)
Accumulated deficit							2,514,091,000		2,514,091,000		$ 2,377,436,000
Cash, cash equivalents and restricted cash				$ 668,710,000			892,844,000	$ 668,710,000	892,844,000	$ 668,710,000	642,095,000	$ 466,091,000
Marketable securities							29,490,000		29,490,000		236,882,000
Short-term Credit Line, outstanding balance							80,469,000		80,469,000		$ 80,402,000
Collateral amount							150,000,000.0		150,000,000.0
Remaining borrowing capacity							$ 20,000,000.0		$ 20,000,000.0
Common stock, shares issued | shares							124,137,000		124,137,000		119,581,000
Payment of offering expenses				400,000
Proceeds from issuance of common stock				$ 235,800,000
Convertible Notes
Policies
Outstanding principal balance		$ 287,500,000	$ 287,500,000			$ 287,500,000	$ 287,500,000		$ 287,500,000
Per annum interest rate (as a percent)		2.25%				2.25%			2.25%
Percentage of principal amount converted		100.00%	100.00%
Convertible to shares of common stock			7,411,704
Convertible Notes | Subsequent event
Policies
Convertible Notes Payable	$ 287,400,000
Convertible to shares of common stock	7,500,000
Proceeds from notes payable	$ 100,000
Line Of Credit-UBS
Policies
Short-term Credit Line, outstanding balance							80,400,000		$ 80,400,000
Borrowings under credit facility					$ 30,000,000.0
Collateral amount							150,000,000.0		150,000,000.0
Remaining borrowing capacity							$ 20,000,000.0		$ 20,000,000.0
Interest rate (as a percent)							5.66%		5.66%
Equity offering
Policies
Common stock, shares issued | shares				4,550,000				4,550,000		4,550,000
Stock issued (in dollars per share) | $ / shares				$ 55				$ 55		$ 55