Collaboration Agreements - Sanofi (Details) - USD ($)		3 Months Ended		9 Months Ended		60 Months Ended
		Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Dec. 31, 2022
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaboration revenue from customers	[1]	$ 1,267,000	$ 184,000	$ 330,531,000	$ 94,805,000
Sanofi | Collaborative Arrangement
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Contract liability		0		0		$ 0	$ 0
Transaction price, increase (decrease)		0	0	$ 25,000,000	$ 40,000,000
Collaboration revenue from customers		$ 0	$ 0
Sanofi | Collaborative Arrangement | Milestone Triggered
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaboration revenue from customers						100,000,000
Sanofi | Collaborative Arrangement | Product
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Collaboration revenue from customers						$ 0

[1] Includes related-party collaboration revenue from customers of $1.3 million and $295.5 million for the three and nine months ended September 30, 2023, respectively, and $0.2 million and $2.9 million for the three and nine months ended September 30, 2022, respectively.