Quarterly report pursuant to Section 13 or 15(d)

License, Clinical Trial and Sponsored Research Agreements (City of Hope - Licenses) (Narrative) (Details)

v3.21.1
License, Clinical Trial and Sponsored Research Agreements (City of Hope - Licenses) (Narrative) (Details)
 3 Months Ended
May 31, 2017
USD ($)
Milestone
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Research and development - licenses acquired   $ 0 $ 250,000
License Agreements [Member] | City of Hope National Medical Center ("COH") [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Research and development - licenses acquired   0 250,000
License Agreements [Member] | CD123 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Milestones payable   300,000  
License Agreements [Member] | HER2 Product or Process [Member] | City of Hope National Medical Center ("COH") [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Annual maintenance fee payable $ 50,000    
Upfront fees paid $ 600,000    
Number of milestones | Milestone 10    
Milestones payable $ 14,900,000    
Research and development - licenses acquired   $ 0 $ 250,000