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 6 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
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
License, Clinical Trial and Sponsored Research Agreements                            
Research and development expense                     $ 4,360 $ 10,836 $ 8,164 $ 24,836
PSCA (MB-105) [Member] | City of Hope National Medical Center                            
License, Clinical Trial and Sponsored Research Agreements                            
Total reimbursement payments made                     500   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 | IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center                            
License, Clinical Trial and Sponsored Research Agreements                            
Contribution toward patient costs                   $ 100        
Contribution per patient               100            
Annual maintenance fee payable               200            
Sponsored research and clinical trial agreements | CS1 (MB-104) [Member] | City of Hope National Medical Center                            
License, Clinical Trial and Sponsored Research Agreements                            
Total reimbursement payments made                     $ 2,200   $ 2,200  
Sponsored research and clinical trial agreements | CS1 (MB-104) [Member] | City of Hope National Medical Center | Maximum [Member]                            
License, Clinical Trial and Sponsored Research Agreements                            
Milestones payable                 $ 2,400          
Sponsored research and clinical trial agreements | PSCA (MB-105) [Member] | City of Hope National Medical Center | Maximum [Member]                            
License, Clinical Trial and Sponsored Research Agreements                            
Milestones payable               $ 2,300            
Sponsored research and clinical trial agreements | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center                            
License, Clinical Trial and Sponsored Research Agreements                            
Milestones payable   $ 5,300                        
Additional milestone payments         $ 2,200   $ 1,800              
Contribution toward patient costs             $ 800              
Sponsored research and clinical trial agreements | CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center | Maximum [Member]                            
License, Clinical Trial and Sponsored Research Agreements                            
Additional milestone payments         $ 9,300                  
Sponsored research and clinical trial agreements | RAG1 SCID (MB-110) [Member] | Leiden University Medical Center                            
License, Clinical Trial and Sponsored Research Agreements                            
Agreement term 5 years                          
Annual maintenance fee payable $ 500                          
Sponsored research and clinical trial agreements | Car T Technology [Member] | Mayo Clinic                            
License, Clinical Trial and Sponsored Research Agreements                            
Milestones payable       $ 100   $ 2,100                
Agreement term           2 years