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License Agreements, Clinical Research Support Agreements and Sponsored Research Agreements (Details) - USD ($)
$ in Thousands
10 Months Ended 12 Months Ended
Dec. 31, 2015
Dec. 31, 2015
Dec. 31, 2017
Dec. 31, 2016
Research and development - licenses acquired $ 2,337 $ 2,337 $ 12,433 $ 6,079
CART [Member]        
Research and development - licenses acquired   2,147 0 1,683
IL13Ra2 [Member]        
Research and development - licenses acquired   0 500 0
IV/ICV [Member]        
Research and development - licenses acquired   0 125 0
PSCA [Member]        
Research and development - licenses acquired   0 300 0
HER2 [Member]        
Research and development - licenses acquired   0 600 0
CS1 [Member]        
Research and development - licenses acquired   0 600 0
CRISPR [Member] [Member]        
Research and development - licenses acquired   0 250 0
Fortress PIK Dividend [Member]        
Research and development - licenses acquired   190 9,558 4,396
UCLA [Member]        
Research and development - licenses acquired   0 200 0
Fred Hutch CD20 [Member]        
Research and development - licenses acquired   $ 0 $ 300 $ 0