Quarterly report pursuant to Section 13 or 15(d)

Significant Accounting Policies (Narrative) (Details)

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Significant Accounting Policies (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended
Jan. 01, 2021
Jul. 22, 2016
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Class of Stock [Line Items]          
Property, plant and equipment, gross     $ 12,567   $ 11,595
Research and development     11,618 $ 9,314  
Construction in Process [Member]          
Class of Stock [Line Items]          
Property, plant and equipment, gross     $ 1,458   $ 499
Fortress Biotech, Inc [Member]          
Class of Stock [Line Items]          
Percentage of fully diluted equity 2.50% 2.50%   2.50%