Quarterly report pursuant to Section 13 or 15(d)

Licenses Acquired - Mustang expenses (Details)

v3.20.2
Licenses Acquired - Mustang expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired $ 1,570 $ 200 $ 1,820 $ 650
Mustang [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired 1,300 200 1,550 650
Mustang [Member] | City of Hope (COH) - CD123 (MB-102) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired 334   334 250
Mustang [Member] | City of Hope (COH) - IL13R2 (MB-101) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired 333   333  
Mustang [Member] | City of Hope (COH) - HER2 (MB-103) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired     250  
Mustang [Member] | City of Hope (COH) - CSI (MB-104) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired   $ 200   200
Mustang [Member] | City of Hope (COH) - Spacer [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired 333   333  
Mustang [Member] | Fred Hutch - CD20 CAR T (MB-106) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired $ 300   $ 300  
Mustang [Member] | Nationwide Children's Hospital - C134 (MB-108) [Member]        
Research and Development Arrangement, Contract to Perform for Others [Line Items]        
Total Research and Development - Licenses Acquired       $ 200