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)

v3.21.1
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
Mar. 31, 2021
Mar. 31, 2020
Research and development expense $ 20,154 $ 15,117
Research and Clinical Trial Agreements [Member] | Aevitas [Member]    
Research and development expense 248 281
Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 1,842 1,349
Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]    
Research and development expense 323 0
City of Hope (COH) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 0 500
City of Hope (COH) [Member] | MB-102 (CD 123 CAR T for AML) [Member] | Research and Clinical Trial Agreements [Member]    
Research and development expense 200 200
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 expense 205 230
City of Hope (COH) [Member] | MB-101 (IL13R2 CAR T for Glioblastoma) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 514 92
City of Hope (COH) [Member] | MB-104 (CS1 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 175 0
City of Hope (COH) [Member] | MB-103 (HER2 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 123 0
City of Hope (COH) [Member] | MB-105 (PSCA CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 50 0
St. Jude Children's Research Hospital [Member] | MB-107 (XSCID) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 104 0
Fred Hutchinson Cancer Research Center [Member] | MB-106 (CD20 CAR T) [Member] | Research and Clinical Trial Agreements [Member] | Mustang [Member]    
Research and development expense 671 527
Columbia University [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]    
Research and development expense 188 0
University of Oxford [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]    
Research and development expense 79 0
University of California [Member] | Research and Clinical Trial Agreements [Member] | Oncogenuity [Member]    
Research and development expense 56 0
University of Massachusetts [Member] | Research and Clinical Trial Agreements [Member] | Aevitas [Member]    
Research and development expense 248 0
University of Pennsylvania [Member] | Research and Clinical Trial Agreements [Member] | Aevitas [Member]    
Research and development expense $ 0 $ 281