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Kolltan Acquisition - Pro Forma (Details) - USD ($) $ in Thousands |  | 1 Months Ended | 3 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Nov. 29, 2016 | Dec. 31, 2016 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
Kolltan Acquisition |  |  |  |  |  |  |  |  |  |  |
Transaction expense |  | $ 700 |  |  |  |  |  |  |  |  | $ 700
Revenue |  |  | $ 1,764 | $ 941 | $ 2,763 | $ 4,068 | $ 3,456 | $ 3,924 | $ 3,829 | $ 1,534 |
Kolltan |  |  |  |  |  |  |  |  |  |  |
Kolltan Acquisition |  |  |  |  |  |  |  |  |  |  |
Severance expense |  | 3,100 |  |  |  |  |  |  |  |  |
Transaction expense | $ 3,768 |  |  |  |  |  |  |  |  |  |
Revenue |  | $ 0 |  |  |  |  |  |  |  |  |
Pro Forma Financial Information |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  | 6,786
Net loss |  |  |  |  |  |  |  |  |  |  | $ (146,905)

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