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 9 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total $ 300 $ 1,000 $ 3,394 $ 3,143
Fortress [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 300 0
Checkpoint Therapeutics, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 1,000 400 3,060
Helocyte [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 0 83
Mustang Therapeutics, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 300 0 2,375 0
Caelum Biosciences, Inc. [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 0 219 0
Cyprium Therapeutics, Inc. [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total $ 0 $ 0 $ 100 $ 0