Quarterly report pursuant to Section 13 or 15(d)

Related Party Agreements (Narrative) (Details)

v3.21.1
Related Party Agreements (Narrative) (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Jan. 01, 2021
Jul. 22, 2016
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
At the Market Offering [Member]          
Related Party Transaction [Line Items]          
Proceeds from issuance of common shares - Public Offering     $ 48.4 $ 5.0  
Common Shares [Member]          
Related Party Transaction [Line Items]          
Issuance of common shares - Founders Agreement (in shares)     2,001,490 1,206,667  
Fortress Biotech, Inc [Member]          
Related Party Transaction [Line Items]          
Percentage of annual fees expense related to Management Services Agreement recorded in research and development expenses     50.00% 50.00%  
Percentage of annual fees expense related to Management Services Agreement recorded in general and administrative expenses     50.00% 50.00%  
Issuance of common shares - Founders Agreement (in shares) 2,001,490   325,221    
Proceeds from issuance of common shares - Public Offering       $ 48.4  
Percentage of fully diluted equity 2.50% 2.50%   2.50%  
Expenses from related party transaction     $ 0.1 $ 0.1  
Fortress Biotech, Inc [Member] | Research and Development [Member]          
Related Party Transaction [Line Items]          
Expenses from related party transaction         $ 7.6
Fortress Biotech, Inc [Member] | General and Administrative [Member]          
Related Party Transaction [Line Items]          
Expenses from related party transaction     $ 1.2