Registration of securities issued in business combination transactions

Subsequent Event (Details)

v3.20.2
Subsequent Event (Details) - USD ($)
12 Months Ended
Feb. 08, 2020
Dec. 31, 2019
Subsequent Event [Line Items]    
Upfront payment $ 250,000 $ 3,000,000
RX-0201 And RX-0301 [Member]    
Subsequent Event [Line Items]    
Milestone payment 63,000,000  
RX-0047 [Member]    
Subsequent Event [Line Items]    
Milestone payment $ 33,000,000