Collaborations - Change in Accounts Receivable, Contract Asset and Liabilities (Details) $ in Thousands	3 Months Ended
	Mar. 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	20,947
Accounts receivable and contract assets, Deductions	(1,894)
Accounts receivable and contract assets, Ending balance	20,000
Contract Liabilities, Beginning balance	13,576
Contract Liabilities, Additions	20,000
Contract Liabilities, Deductions	(22,100)
Contract Liabilities, Ending balance	11,476
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	947
Accounts receivable and contract assets, Deductions	(947)
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	(947)
Accounts receivable and contract assets, Ending balance	20,000
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	(22,100)
Contract Liabilities, Ending balance	$ 11,476