Annual report pursuant to Section 13 and 15(d)

Licenses Acquired - Mustang expenses (Details)

v3.20.1
Licenses Acquired - Mustang expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense $ 6,090 $ 4,050
Mustang [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 1,350 1,275
Mustang [Member] | City of Hope (COH) - CD123 (MB-102) [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 250 0
Mustang [Member] | CSI City of Hope Milestone (MB-104) [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 200 0
Mustang [Member] | City Of Hope MB-105 [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 200 0
Mustang [Member] | CSL Behring MB-107 [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 200 0
Mustang [Member] | UCLA MB-105 [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 300 0
Mustang [Member] | City Of Hope Mb 103 [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 0 200
Mustang [Member] | XSCID License St Judes [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 0 1,000
Mustang [Member] | Manufacturing License [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense 0 75
Mustang [Member] | Nationwide Children's Hospital - C134 [Member]    
Research and Development Arrangement, Contract to Perform for Others [Line Items]    
Total licenses acquired expense $ 200 $ 0