Quarterly report pursuant to Section 13 or 15(d)

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

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Clinical Trial and Sponsored Research Agreements (City of Hope - Sponsored Research and Clinical Trial Agreements) (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
Sep. 08, 2021
Jul. 03, 2017
Nov. 30, 2022
Oct. 31, 2022
Jan. 31, 2022
Jun. 30, 2021
Nov. 30, 2020
Oct. 31, 2020
Jun. 30, 2020
Feb. 28, 2017
Mar. 31, 2024
Mar. 31, 2023
License, Clinical Trial and Sponsored Research Agreements                        
Research and development expense                     $ 3,804 $ 14,000
PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Total reimbursement payments made                     500  
IL13Ra2 CAR and (C134) [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Research and development expense     $ 600         $ 300        
Sponsored Research and Clinical Trial Agreements [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Research and development expense                     34 1,742
Sponsored Research and Clinical Trial Agreements [Member] | Mayo Clinic [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Research and development expense                     0 275
Sponsored Research and Clinical Trial Agreements [Member] | IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Contribution toward patient costs                   $ 100    
Contribution per patient               100        
Research and development expense                     280 310
Annual maintenance fee payable               200        
Sponsored Research and Clinical Trial Agreements [Member] | CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Research and development expense                     0 50
Total reimbursement payments made                     2,200  
Sponsored Research and Clinical Trial Agreements [Member] | CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum                        
License, Clinical Trial and Sponsored Research Agreements                        
Milestones payable                 $ 2,400      
Sponsored Research and Clinical Trial Agreements [Member] | PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Research and development expense                     0 22
Sponsored Research and Clinical Trial Agreements [Member] | PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] | Maximum                        
License, Clinical Trial and Sponsored Research Agreements                        
Milestones payable               $ 2,300        
Sponsored Research and Clinical Trial Agreements [Member] | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Milestones payable   $ 5,300                    
Additional milestone payments         $ 2,200   $ 1,800          
Contribution toward patient costs             $ 800          
Research and development expense                     0 554
Sponsored Research and Clinical Trial Agreements [Member] | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center [Member] | Maximum                        
License, Clinical Trial and Sponsored Research Agreements                        
Additional milestone payments         $ 9,300              
Sponsored Research and Clinical Trial Agreements [Member] | ST. Jude - XSCID [Member] | St. Jude Children's Research Hospital [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Research and development expense                     434 419
Sponsored Research and Clinical Trial Agreements [Member] | RAG1 SCID (MB-110) [Member] | Leiden University Medical Centre [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Agreement term 5 years                      
Research and development expense                     $ 120 $ 112
Annual maintenance fee payable $ 500                      
Sponsored Research and Clinical Trial Agreements [Member] | Car T Technology [Member] | Mayo Clinic [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Milestones payable           $ 2,100            
Agreement term           2 years            
Clinical Trial Agreements [Member] | Car T Technology [Member] | Mayo Clinic [Member]                        
License, Clinical Trial and Sponsored Research Agreements                        
Milestones payable       $ 100