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
Mar. 31, 2018
Mar. 31, 2017
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total $ 97 $ 1,294
Checkpoint Therapeutics, Inc [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 0 400
Helocyte [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 21 0
Mustang Therapeutics, Inc [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 75 575
Cellvation [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 1 0
Caelum Biosciences, Inc. [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total 0 219
Cyprium Therapeutics, Inc. [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and Development Total $ 0 $ 100