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License Agreements - Zai Lab (Details) - Zai Lab Ltd - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Aug. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Upfront and immediate milestone payment to be received under license agreement $ 17.5          
Research and development expenses reimbursed   $ 3.2 $ 0.0 $ 3.2 $ 0.2  
Reimbursable costs included in accounts receivable   $ 0.8   $ 0.8   $ 0.6
Development and Regulatory Milestones | Maximum            
Upfront payment under license agreement 22.5          
Sales and Commercial Milestones | Maximum            
Upfront payment under license agreement $ 37.5