Annual report pursuant to Section 13 and 15(d)

Licenses Acquired (Schedule of Research and Development for Licenses Acquired) (Details)

v3.22.1
Licenses Acquired (Schedule of Research and Development for Licenses Acquired) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired $ 15,625 $ 2,834
Licensing Agreements [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 15,625 2,834
Licensing Agreements [Member] | Journey [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 13,819 0
Licensing Agreements [Member] | Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 1,630 2,489
Licensing Agreements [Member] | Other [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 176 345
Licensing Agreements [Member] | City of Hope (COH) [Member] | Mustang [Member] | MB-102 (CD 123 CAR T for AML) [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 250 334
Licensing Agreements [Member] | City of Hope (COH) [Member] | Mustang [Member] | MB-101 (IL13R2 CAR T for Glioblastoma) [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 0 334
Licensing Agreements [Member] | City of Hope (COH) [Member] | Mustang [Member] | MB-103 (HER2 CAR T) [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 0 500
Licensing Agreements [Member] | City of Hope (COH) [Member] | Mustang [Member] | MB-104 (CS1 CAR T) [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 0 200
Licensing Agreements [Member] | City of Hope (COH) [Member] | Mustang [Member] | MB-105 (PSCA CAR T) [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 250 200
Licensing Agreements [Member] | City of Hope (COH) [Member] | Mustang [Member] | Spacer [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 0 334
Licensing Agreements [Member] | Mayo Clinic [Member] | Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 750 0
Licensing Agreements [Member] | Fred Hutchinson Cancer Research Center [Member] | Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 0 300
Licensing Agreements [Member] | Leiden University Medical Centre [Member] | Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 350 0
Licensing Agreements [Member] | CSL Behring [Member] | Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired 30 170
Licensing Agreements [Member] | SIRION Biotech [Member] | Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Research and development - licenses acquired $ 0 $ 117