Quarterly report pursuant to Section 13 or 15(d)

Licenses Acquired - Mustang expenses (Details)

v3.20.1
Licenses Acquired - Mustang expenses (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total Research and Development - Licenses Acquired $ 250 $ 450
Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total Research and Development - Licenses Acquired 250 450
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   250
Mustang [Member] | 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] | Nationwide Children's Hospital - C134 [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total Research and Development - Licenses Acquired   $ 200