Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.1
License, Clinical Trial and Sponsored Research Agreements (Sponsored Research and Clinical Trial Agreements) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense $ 11,618 $ 9,314
Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 1,842 1,349
City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 0 500
CD123 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 205 230
IL13Ra2 Product [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 514 92
CS1 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 175 0
HER2 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 123 0
PSCA Product or Process [Member] | City of Hope National Medical Center ("COH") [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 50 0
CD20 Product or Process [Member] | Fred Hutchinson Cancer Research Center [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense 671 527
ST. Jude - XSCID [Member] | St. Jude Children's Research Hospital [Member] | Sponsored Research and Clinical Trial Agreements [Member]    
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]    
Research and development expense $ 104 $ 0