Quarterly report pursuant to Section 13 or 15(d)

Milestones and Sponsored Research Agreements - Additional Information (Detail)

v3.5.0.2
Milestones and Sponsored Research Agreements - Additional Information (Detail) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2016
Aug. 31, 2016
Mar. 31, 2016
Feb. 29, 2016
Oct. 31, 2015
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Mar. 31, 2015
Milestones and Sponsored Research Agreements [Line Items]                    
Payments to Acquire in Process Research and Development         $ 200          
Research And Development Expense           $ 7,316 $ 9,073 $ 21,416 $ 13,172  
Helocyte Inc [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Research And Development Expense           900   2,900    
Payments For Research And Development Expenses   $ 2,000                
Prepaid Research And Development $ 1,100                  
Helocyte Inc [Member] | Pep Vax [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Payments For Research And Development Expenses   1,000                
Prepaid Research And Development 500                  
Helocyte Inc [Member] | Triplex [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Payments For Research And Development Expenses   $ 1,000                
Prepaid Research And Development 600                  
Mustang Bio, Inc [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Research And Development Expense           500 $ 1,500 500 $ 1,000  
Research and Development Expense Payable, Milestone Payment                   $ 2,000
UCLB [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Research and Development Expense Payable, Milestone Payment $ 22,000         $ 22,000   22,000    
Milestone Payments     $ 400              
Payment of Upfront Fees               $ 100    
UCLB [Member] | Maximum [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Royalty Percentage     5.00%              
UCLB [Member] | Minimum [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Royalty Percentage     3.00%              
City Of Hope [Member]                    
Milestones and Sponsored Research Agreements [Line Items]                    
Payments to Acquire in Process Research and Development     $ 1,000 $ 1,000            
Research and Development Expense Payable, Milestone Payment     $ 2,000 $ 3,400