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Kolltan Acquisition (Details) - Kolltan - USD ($) $ in Millions | Nov. 29, 2016 | Dec. 31, 2019
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Kolltan Acquisition |  |
Shares issued as part of consideration (in shares) | 1,217,200 |
Specified development, regulatory approvals or sales-based milestones |  |
Kolltan Acquisition |  |
Potential milestone payments | $ 172.5 | $ 127.5

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