Collaborations - Change in Accounts Receivable, Contract Asset and Liabilities (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2026 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Accounts receivable and contract assets, Beginning balance	$ 0
Accounts receivable and contract assets, Additions	65,000
Accounts receivable and contract assets, Deductions	(45,000)
Accounts receivable and contract assets, Ending balance	20,000
Contract Liabilities, Beginning balance	34,365
Contract Liabilities, Additions	45,000
Contract Liabilities, Deductions	(79,365)
Contract Liabilities, Ending balance	0
Billed Receivables - Sanofi
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Accounts receivable and contract assets, Beginning balance	0
Accounts receivable and contract assets, Additions	20,000
Accounts receivable and contract assets, Deductions	0
Accounts receivable and contract assets, Ending balance	20,000
Billed Receivables - Gilead
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Accounts receivable and contract assets, Beginning balance	0
Accounts receivable and contract assets, Additions	45,000
Accounts receivable and contract assets, Deductions	(45,000)
Accounts receivable and contract assets, Ending balance	0
Deferred Revenue - Gilead
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contract Liabilities, Beginning balance	34,365
Contract Liabilities, Additions	45,000
Contract Liabilities, Deductions	(79,365)
Contract Liabilities, Ending balance	$ 0