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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Total Research and Development - Licenses Acquired $ 1,570 $ 200 $ 1,820 $ 650
Mustang [Member]        
Total Research and Development - Licenses Acquired 1,300 200 1,550 650
Research and clinical trial agreements [Member] | Mustang [Member]        
Total Research and Development - Licenses Acquired 2,816 1,670 4,166 3,265
Research and clinical trial agreements [Member] | Mustang [Member] | COH CAR T [Member]        
Total Research and Development - Licenses Acquired 0 500 500 1,000
Research and clinical trial agreements [Member] | Mustang [Member] | COH - CD123 (MB-102) [Member]        
Total Research and Development - Licenses Acquired 65 456 296 759
Research and clinical trial agreements [Member] | Mustang [Member] | COH - IL13Ra2 (MB-101) [Member]        
Total Research and Development - Licenses Acquired 234 225 326 567
Research and clinical trial agreements [Member] | Mustang [Member] | COH - Manufacturing [Member]        
Total Research and Development - Licenses Acquired 0 115 0 229
Research and clinical trial agreements [Member] | Mustang [Member] | COH - CS1 (MB-104) [Member]        
Total Research and Development - Licenses Acquired 770 0 770  
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 - XSCID (MB-107) [Member]        
Total Research and Development - Licenses Acquired 1,558 0 1,558  
Research and clinical trial agreements [Member] | Mustang [Member] | Fred Hutch-CD20 (MB-106) [Member]        
Total Research and Development - Licenses Acquired $ 189 $ 374 $ 716 $ 641