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Kolltan Acquisition - Pro Forma (Details) - USD ($)
$ / shares in Units, $ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Nov. 29, 2016
Dec. 31, 2016
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Kolltan Acquisition                          
Transaction expense   $ 700                   $ 700  
Revenue.     $ 3,456 $ 3,924 $ 3,829 $ 1,534 $ 1,874 $ 2,220 $ 1,389 $ 1,303 $ 12,743 6,786 $ 5,480
Kolltan                          
Kolltan Acquisition                          
Severance expense   3,100                      
Transaction expense $ 3,768                        
Revenue.   $ 0                      
Pro Forma Financial Information                          
Revenue                       6,786 5,480
Net loss                       $ (146,905) $ (157,690)
Basic and Diluted Net Loss Per Common Share                       $ (1.24) $ (1.37)