Annual report pursuant to Section 13 and 15(d)

License, Clinical Trial and Sponsored Research Agreements (License Agreements) (Details)

v3.21.1
License, Clinical Trial and Sponsored Research Agreements (License Agreements) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired $ 10,064 $ 6,273
License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 10,064 6,273
CSL Behring (Calimmune) [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 170 200
University of California [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 0 300
SIRION Biotech GmbH - LentiBOOST [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 117 0
Fortress Biotech, Inc [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 7,577 4,923
CD123 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 334 250
CS1 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 200 200
IL13Ra2 Product [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 333 0
Spacer Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 333 0
PSCA Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 200 200
HER2 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 500 0
CD20 Product or Process [Member] | Fred Hutchinson Cancer Research Center [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired 300 0
Nationwide - C134 [Member] | Nationwide Childrens Hospital [Member] | License Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development for licenses acquired $ 0 $ 200