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License agreements - Zai Lab (Details) - Zai Lab Ltd - USD ($) $ in Millions | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Aug. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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 |  | $ 0.2 | $ 0.2 | $ 0.5
Development and Regulatory Milestones | Maximum |  |  |  |
Upfront payment under license agreement | 22.5 |  |  |
Sales and Commercial Milestones | Maximum |  |  |  |
Upfront payment under license agreement | $ 37.5 |  |  |

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