Quarterly report pursuant to Section 13 or 15(d)

Sponsored Research and Clinical Trial Agreements - Summary of Mustang expense related to its sponsored research agreements (Details)

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Sponsored Research and Clinical Trial Agreements - Summary of Mustang expense related to its sponsored research agreements (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Total Research and Development - Licenses Acquired $ 458 $ 700 $ 2,278 $ 1,350
Mustang [Member]        
Total Research and Development - Licenses Acquired 287 700 1,837 1,350
Research and clinical trial agreements [Member] | Mustang [Member]        
Total Research and Development - Licenses Acquired 734 1,176 4,900 4,441
Research and clinical trial agreements [Member] | Mustang [Member] | City of Hope National Medical Center [Member]        
Total Research and Development - Licenses Acquired 0 500 500 1,500
Research and clinical trial agreements [Member] | Mustang [Member] | City of Hope - CD123 (MB-102) [Member]        
Total Research and Development - Licenses Acquired 48 269 344 1,028
Research and clinical trial agreements [Member] | Mustang [Member] | City of Hope - IL13Ra2 (MB-101) [Member]        
Total Research and Development - Licenses Acquired 96 244 422 811
Research and clinical trial agreements [Member] | Mustang [Member] | City of Hope - Manufacturing [Member]        
Total Research and Development - Licenses Acquired 0 114 0 343
Research and clinical trial agreements [Member] | Mustang [Member] | City of Hope - CS1 (MB-104) [Member]        
Total Research and Development - Licenses Acquired 65 0 835 0
Research and clinical trial agreements [Member] | Mustang [Member] | Beth Israel Deaconess Medical Center - CRISPR        
Total Research and Development - Licenses Acquired 0 0 0 69
Research and clinical trial agreements [Member] | Mustang [Member] | St. Jude Children's Research Hospital XSCID MB-107 [Member]        
Total Research and Development - Licenses Acquired 107 0 1,665 0
Research and clinical trial agreements [Member] | Mustang [Member] | Fred Hutchinson Cancer Research Center CD20 MB-106 [Member]        
Total Research and Development - Licenses Acquired $ 418 $ 49 $ 1,134 $ 690