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Significant agreements - Cancer Research UK (Details) - USD ($) $ in Millions |  | 1 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 13, 2016 | Dec. 31, 2019 | Dec. 31, 2016 | Jun. 30, 2020
Research and development arrangement obligation to repay other parties |  |  |  |
Contingent future milestones payments under research and development arrangement | $ 50.9 | $ 60.3 |  |
Other long term liabilities |  |  |  |
Research and development arrangement obligation to repay other parties |  |  |  |
Liability from research and development |  | $ 2.0 |  | $ 2.1
Commercialization license per candidate |  |  |  |
Research and development arrangement obligation to repay other parties |  |  |  |
Refunding the costs and expenses incurred in case of termination (as a percent) | 50.00% |  |  |
BT1718 | Minimum |  |  |  |
Research and development arrangement obligation to repay other parties |  |  |  |
Tiered royalties (percentage) |  |  | 70.00% |
BT1718 | Maximum |  |  |  |
Research and development arrangement obligation to repay other parties |  |  |  |
Tiered royalties (percentage) |  |  | 90.00% |
BT7401 | Minimum |  |  |  |
Research and development arrangement obligation to repay other parties |  |  |  |
Tiered royalties (percentage) |  | 55.00% |  |
BT7401 | Maximum |  |  |  |
Research and development arrangement obligation to repay other parties |  |  |  |
Tiered royalties (percentage) |  | 80.00% |  |

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