Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
License, Clinical Trial and Sponsored Research Agreements (License Agreements) (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development for licenses acquired $ 1,000,000 $ 1,300,000 $ 1,000,000 $ 1,550,000
License Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development for licenses acquired 1,000,000 1,300,000 1,000,000 1,550,000
Mayo Clinic [Member] | License Agreements [Member]        
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]        
Research and development for licenses acquired 750,000 0 750,000 0
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 250,000 334,000 250,000 334,000
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 0 333,000 0 333,000
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 0 333,000 0 333,000
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 0 0 0 250,000
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 $ 0 $ 300,000 $ 0 $ 300,000