Collaborations - Change in Accounts Receivable, Contract Asset and Liabilities (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2025 USD ($)
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Accounts receivable and contract assets, Beginning balance	$ 947
Accounts receivable and contract assets, Additions	80,947
Accounts receivable and contract assets, Deductions	(81,894)
Accounts receivable and contract assets, Ending balance	0
Contract Liabilities, Beginning balance	13,576
Contract Liabilities, Additions	60,000
Contract Liabilities, Deductions	(39,211)
Contract Liabilities, Ending balance	34,365
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	20,947
Accounts receivable and contract assets, Deductions	(20,947)
Accounts receivable and contract assets, Ending balance	0
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	40,000
Accounts receivable and contract assets, Deductions	(40,000)
Accounts receivable and contract assets, Ending balance	0
Unbilled Receivables - Sanofi
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Accounts receivable and contract assets, Beginning balance	947
Accounts receivable and contract assets, Additions	20,000
Accounts receivable and contract assets, Deductions	(20,947)
Accounts receivable and contract assets, Ending balance	0
Deferred Revenue - Sanofi
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contract Liabilities, Beginning balance	13,576
Contract Liabilities, Additions	20,000
Contract Liabilities, Deductions	(33,576)
Contract Liabilities, Ending balance	0
Deferred Revenue - Gilead
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Contract Liabilities, Beginning balance	0
Contract Liabilities, Additions	40,000
Contract Liabilities, Deductions	(5,635)
Contract Liabilities, Ending balance	$ 34,365