Quarterly report pursuant to Section 13 or 15(d)

Clinical Trial and Sponsored Research Agreements (Sponsored Research and Clinical Trial Agreements) (Details)

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Clinical Trial and Sponsored Research Agreements (Sponsored Research and Clinical Trial Agreements) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense $ 3,804 $ 14,000
Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense 34 1,742
Mayo Clinic [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense 0 275
IL13Ra2 (MB-101) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense 280 310
CS1 (MB-104) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense 0 50
PSCA (MB-105) [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense 0 22
CD20 (MB-106) [Member] | Fred Hutchinson Cancer Center [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense 0 554
ST. Jude - XSCID [Member] | St. Jude Children's Research Hospital [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense 434 419
RAG1 SCID (MB-110) [Member] | Leiden University Medical Centre [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
License, Clinical Trial and Sponsored Research Agreements    
Research and development expense $ 120 $ 112