Collaboration, License and Option Agreements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2021	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	300	$ 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	$ 0