Quarterly report pursuant to Section 13 or 15(d)

Licenses Acquired - Additional Information (Details)

v3.19.3
Licenses Acquired - Additional Information (Details) - USD ($)
$ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Feb. 01, 2019
Aug. 31, 2019
May 31, 2019
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired       $ 700 $ 3,706 $ 1,350 $ 3,804
License with Calimmune [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Payment For Research And Development Licenses   $ 200          
CSI City of Hope Milestone (MB-104) [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired           200  
Mustang [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired       700 1,000 1,350 1,075
Mustang [Member] | License with Calimmune [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired       200   200  
Research And Development Licenses Payments Due   $ 1,000          
Mustang [Member] | License with University of California [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired       300   300  
Mustang [Member] | PSCA License [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired       200   200  
Mustang [Member] | CD123 License [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Payments For Research And Development Expenses       $ 0   300  
Mustang [Member] | CSI City of Hope Milestone (MB-104) [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and Development in Process     $ 200        
Mustang [Member] | Nationwide Children's Hospital - C134 [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Payment For Research And Development Licenses $ 200            
Research and development - licenses acquired           $ 200  
Research And Development Licenses Payments Due $ 152,800            
Checkpoint [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired         1,000   1,000
Checkpoint [Member] | Dana Farber License CK-301 [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired         1,000   1,000
Helocyte [Member]              
Research and Development Arrangement, Contract to Perform for Others [Line Items]              
Research and development - licenses acquired         $ 1,500   $ 1,521