Quarterly report pursuant to Section 13 or 15(d)

License, Clinical Trial and Sponsored Research Agreements (City of Hope - Licenses) (Narrative) (Details)

v3.21.2
License, Clinical Trial and Sponsored Research Agreements (City of Hope - Licenses) (Narrative) (Details)
€ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Sep. 08, 2021
USD ($)
Apr. 01, 2021
USD ($)
Milestone
Aug. 23, 2019
USD ($)
Milestone
Jul. 03, 2017
USD ($)
Milestone
May 31, 2017
USD ($)
Milestone
Oct. 31, 2020
USD ($)
Milestone
Oct. 31, 2020
EUR (€)
Milestone
May 31, 2017
USD ($)
Milestone
Feb. 28, 2017
USD ($)
Milestone
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Research and development - licenses acquired                   $ 630,000 $ 287,000 $ 1,630,000 $ 1,837,000
License Agreements [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Research and development - licenses acquired                   630,000 287,000 1,630,000 1,837,000
License Agreements [Member] | Leiden University Medical Centre [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Upfront fees paid $ 400,000                        
Research and development - licenses acquired                   350,000 0 350,000 0
License Agreements [Member] | Leiden University Medical Centre [Member] | Achievement of Certain Milestones [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Milestones payable $ 31,000,000                        
License Agreements [Member] | CD123 (MB-102) [Member] | City of Hope National Medical Center ("COH") [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Number of milestones | Milestone                 8        
Milestones payable                 $ 14,500,000        
Research and development - licenses acquired                   0 0 250,000 334,000
License Agreements [Member] | IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Number of milestones | Milestone                 8        
Milestones payable                 $ 14,500,000        
Research and development - licenses acquired                   0 0 0 333,000
License Agreements [Member] | Spacer [Member] | City of Hope National Medical Center ("COH") [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Research and development - licenses acquired                   0 0 0 333,000
License Agreements [Member] | PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Annual maintenance fee payable               $ 50,000          
Upfront fees paid               $ 300,000          
Number of milestones | Milestone               10          
Milestones payable               $ 14,900,000          
Research and development - licenses acquired                   250,000 0 250,000 0
License Agreements [Member] | XSCID (MB-107 and MB-207) [Member] | CSL Behring (Calimmune) [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Upfront fees paid     $ 200,000                    
Number of milestones | Milestone     3                    
Milestones payable     $ 1,200,000                    
Research and development - licenses acquired                   30,000 170,000 30,000 170,000
License Agreements [Member] | HER2 (MB 103) [Member] | City of Hope National Medical Center ("COH") [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Annual maintenance fee payable         $ 50,000                
Upfront fees paid         $ 600,000                
Number of milestones | Milestone         10                
Milestones payable         $ 14,900,000                
Research and development - licenses acquired                   0 0 0 250,000
License Agreements [Member] | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Research Center [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Annual maintenance fee payable       $ 50,000                  
Upfront fees paid       $ 300,000                  
Number of milestones | Milestone       11                  
Milestones payable       $ 39,100,000                  
Research and development - licenses acquired                   0 0 0 300,000
License Agreements [Member] | Car T Technology [Member] | Mayo Clinic [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Annual maintenance fee payable   $ 25,000                      
Upfront fees paid   $ 800,000                      
Number of milestones | Milestone   11                      
Milestones payable   $ 92,600,000                      
Research and development - licenses acquired                   0 0 750,000 0
License Agreements [Member] | LentiBOOST Technology [Member] | SIRION Biotech [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Upfront fees paid           $ 100,000 € 0.1            
Research and development - licenses acquired                   $ 0 $ 117,000 $ 0 $ 117,000
License Agreements [Member] | LentiBOOST Technology [Member] | SIRION Biotech [Member] | Achievement of Certain Milestones [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Number of milestones | Milestone           5 5            
Milestones payable           $ 5,400,000 € 4.7            
License Agreements [Member] | LentiBOOST Technology [Member] | SIRION Biotech [Member] | Worldwide net Sales of Licensed Products [Member]                          
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                          
Number of milestones | Milestone           3 3            
Milestones payable           $ 4,000,000.0 € 3.5