Collaboration, License and Option Agreements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaboration Amendment Date			2019-12
Upfront Non-Refundable Payment			$ 20,000
Transaction Price Of The Agreement			25,000
Current portion of deferred revenue	$ 19,806		19,806		$ 19,806
Service Contracts
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Revenues	0		$ 300
Amended BeiGene Collaboration
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Collaboration Amendment Date			2020-10
Reimbursement Of Manufacturing Costs			$ 5,000
Amended Milestone Payments			225,500
Original Milestone Payments			249,000
Performance Obligations Milestone Payment			5,000
Revenues	$ 0	$ 200	$ 0	$ 400