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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, 2020
Upfront and immediate milestone payment to be received under license agreement | $ 17.5 |
Research and development expenses reimbursed |  | $ 0.2
Reimbursable costs included in accounts receivable |  | $ 0.2
Development Regulatory And Commercial Milestones |  |
Upfront payment under license agreement | $ 37.5 |

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