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, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total $ 2,060 $ 1,548 $ 2,143 $ 8,987
Mustang Therapeutics, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 (113) 0 2,147
Checkpoint Therapeutics, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 2,060 33 2,060 2,033
Coronado SO Co, Inc [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 428 0 1,607
Helocyte [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total 0 200 83 200
Avenue Therapeutics, Inc. [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Research and Development Total $ 0 $ 1,000 $ 0 $ 3,000