Collaboration, License and Option Agreements - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 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
Amended Bei Gene 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	$ 100