Quarterly report pursuant to Section 13 or 15(d)

Licenses Acquired - Summary Of Research and Development Arrangement Contract (Detail)

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Licenses Acquired - Summary Of Research and Development Arrangement Contract (Detail) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total $ 1 $ 1,800 $ 98 $ 3,094
Fortress [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 300 0 300
Checkpoint Therapeutics, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 0 400
Helocyte [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 21 0
Mustang Therapeutics, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 1,500 75 2,075
Cellvation [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 1 0
Caelum Biosciences, Inc. [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 0 219
Cyprium Therapeutics, Inc. [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 0 $ 100
Aevitas [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total $ 1 $ 0 $ 1