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License Agreements - Zai Lab (Details) - Zai Lab Ltd - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Aug. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Upfront and immediate milestone payment to be received under license agreement	$ 17.5
Research and development expenses reimbursed		$ 0.0	$ 0.2
Reimbursable costs included in accounts receivable		$ 0.7		$ 0.6
Development and Regulatory Milestones | Maximum
Upfront and immediate milestone payment to be received under license agreement	22.5
Development Regulatory And Commercial Milestones | Maximum
Upfront and immediate milestone payment to be received under license agreement	$ 37.5

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