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Kolltan Acquisition - Purchase Price (Details) - USD ($) $ / shares in Units, $ in Thousands |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Nov. 29, 2016 | Dec. 31, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Dec. 31, 2017
Acquisition-date fair value of consideration transferred |  |  |  |  |
Fair value of contingent consideration |  |  |  | $ 13,779 | $ 43,400
Kolltan transaction expenses paid in cash by the Company |  | $ 700 | $ 700 |  |
Kolltan |  |  |  |  |
Kolltan Acquisition |  |  |  |  |
Price of common stock (in dollars per share) | $ 60.30 |  |  |  |
Acquisition-date fair value of consideration transferred |  |  |  |  |
Fair value of common stock issued for upfront payment | $ 73,397 |  |  |  |
Fair value of contingent consideration | 44,200 |  |  |  |
Kolltan transaction expenses paid in cash by the Company | 3,768 |  |  |  |
Total consideration transferred | $ 121,365 |  |  |  |

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