Related Party Transactions - Narrative (Details) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)	Dec. 31, 2024 USD ($)	Feb. 28, 2024 director	Feb. 12, 2024 $ / shares	Nov. 06, 2021 director
Related Party Transaction
Number of directors \| director			1		1
Collaborative agreements, debt liability	$ 280,200	$ 248,100
Related Party
Related Party Transaction
Per share price of issuance (usd per share) \| $ / shares				$ 6.00
Blackstone Collaboration Agreement
Related Party Transaction
Collaborative agreements, debt liability	236,700
Collaboration agreement, non-cash interest expense including cumulative catch-up adjustment	27,900	10,700
BioNTech Agreements
Related Party Transaction
Collaborative agreements, debt liability	43,500
Collaboration agreement, non-cash interest expense including cumulative catch-up adjustment	$ 8,500	$ (1,800)
Blackstone \| Autolus
Related Party Transaction
Ownership percent, more than (in percent)					10.00%
BioNTech \| Autolus
Related Party Transaction
Ownership percent, more than (in percent)			10.00%