Quarterly report pursuant to Section 13 or 15(d)

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

v3.20.1
License, Clinical Trial and Sponsored Research Agreements - Licenses (Details)
$ in Thousands
 3 Months Ended
May 31, 2017
USD ($)
item
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Research and development - licenses acquired   $ 250 $ 450
License Agreements      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Research and development - licenses acquired   250 450
City Of Hope National Medical Center ("COH") [Member] | License Agreements | CD123 Product Or Process [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Research and development - licenses acquired   0 250
City Of Hope National Medical Center ("COH") [Member] | License Agreements | HER2 Product Or Process [Member]      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Research and development - licenses acquired   250 0
Number of milestones | item 10    
Milestones payable $ 14,900 300  
Nationwide Childrens Hospital [Member] | License Agreements      
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]      
Research and development - licenses acquired   $ 0 $ 200