Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
License, Clinical Trial and Sponsored Research Agreements (City of Hope - Licenses) (Narrative) (Details)
 1 Months Ended 3 Months Ended 6 Months Ended
Apr. 01, 2021
USD ($)
Milestone
Jul. 03, 2017
USD ($)
Milestone
May 31, 2017
USD ($)
Milestone
Feb. 28, 2017
USD ($)
Milestone
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Research and development - 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 - licenses acquired         1,000,000 1,300,000 1,000,000 1,550,000
License Agreements [Member] | Mayo Clinic [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Annual maintenance fee payable $ 25,000              
Upfront fees paid $ 800,000              
Number of milestones | Milestone 11              
Milestones payable $ 92,600,000              
Research and development - licenses acquired         750,000 0 750,000 0
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]                
Number of milestones | Milestone       8        
Milestones payable       $ 14,500,000        
Research and development - licenses acquired         250,000 334,000 250,000 334,000
License Agreements [Member] | IL13Ra2 Product [Member] | City of Hope National Medical Center ("COH") [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Number of milestones | Milestone       8        
Milestones payable       $ 14,500,000        
Research and development - licenses acquired         0 333,000 0 333,000
License Agreements [Member] | Spacer Product or Process [Member] | City of Hope National Medical Center ("COH") [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Research and development - licenses acquired         0 333,000 0 333,000
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 0 0 250,000
License Agreements [Member] | CD20 Product or Process [Member] | Fred Hutchinson Cancer Research Center [Member]                
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]                
Annual maintenance fee payable   $ 50,000            
Upfront fees paid   $ 300,000            
Number of milestones | Milestone   11            
Milestones payable   $ 39,100,000            
Research and development - licenses acquired         $ 0 $ 300,000 $ 0 $ 300,000