Quarterly report pursuant to Section 13 or 15(d)

Sponsored Research and Clinical Trial Agreements (Schedule of Research and Development for Sponsored Research and Clinical Trial Agreements) (Details)

v3.21.2
Sponsored Research and Clinical Trial Agreements (Schedule of Research and Development for Sponsored Research and Clinical Trial Agreements) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Research and development $ 27,367 $ 13,298 $ 70,226 $ 43,868
Research and Clinical Trial Agreements [Member] | Aevitas [Member]        
Research and development 17 163 289 785
Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 1,756 734 4,858 4,900
Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 334 125 1,005 250
City of Hope (COH) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 0 0 0 500
City of Hope (COH) [Member] | MB-102 (CD 123 CAR T for AML) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 24 48 250 344
City of Hope (COH) [Member] | MB-101 (IL13R2 CAR T for Glioblastoma) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 199 96 992 422
City of Hope (COH) [Member] | MB-104 (CS1 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 138 65 510 835
City of Hope (COH) [Member] | MB-103 (HER2 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 319 0 473 0
City of Hope (COH) [Member] | MB-105 (PSCA CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development   0 69 0
Research and development expense (income) 23      
St. Jude Children's Research Hospital [Member] | MB-107 (XSCID) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 330 107 610 1,665
Fred Hutchinson Cancer Research Center [Member] | MB-106 (CD20 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 492 418 1,490 1,134
Mayo Clinic [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 231 0 464 0
Columbia University [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 187 125 562 250
University of Oxford [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 91 0 265 0
University of California [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 56 0 178 0
University of Massachusetts [Member] | Research and Clinical Trial Agreements [Member] | Aevitas [Member]        
Research and development 17 163 289 218
University of Pennsylvania [Member] | Research and Clinical Trial Agreements [Member] | Aevitas [Member]        
Research and development $ 0 $ 0 $ 0 $ 567