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)

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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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Research and development $ 22,831 $ 15,703 $ 42,859 $ 30,570
Research and Clinical Trial Agreements [Member] | Aevitas [Member]        
Research and development 24   272 281
Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 1,260 2,816 3,102 4,166
Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 348 125 671 125
City of Hope (COH) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development     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 21 65 226 296
City of Hope (COH) [Member] | MB-101 (IL13R2 CAR T for Glioblastoma) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 279 234 793 326
City of Hope (COH) [Member] | MB-104 (CS1 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 197 770 372 770
City of Hope (COH) [Member] | MB-103 (HER2 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 31   154 0
City of Hope (COH) [Member] | MB-105 (PSCA CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development     46 0
Research and development expense (income) (4)      
St. Jude Children's Research Hospital [Member] | MB-107 (XSCID) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 176 1,558 280 1,558
Fred Hutchinson Cancer Research Center [Member] | MB-106 (CD20 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 327 189 998 716
Mayo Clinic [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]        
Research and development 233   233 0
Columbia University [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 187 125 375 125
University of Oxford [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 95 0 174 0
University of California [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]        
Research and development 66 $ 0 122 0
University of Massachusetts [Member] | Research and Clinical Trial Agreements [Member] | Aevitas [Member]        
Research and development $ 24   272 0
University of Pennsylvania [Member] | Research and Clinical Trial Agreements [Member] | Aevitas [Member]        
Research and development     $ 0 $ 281