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INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]          
Goodwill $ 13,064   $ 13,064   $ 13,064
Intangibles impairment charge $ 31,700 $ 0 $ 31,700 $ 0  
Percentage of fair value in excess of carrying amount 45.00%   45.00%    
Minimum          
Finite-Lived Intangible Assets [Line Items]          
Percentage of fair value in excess of carrying amount 45.00%   45.00%    
Maximum          
Finite-Lived Intangible Assets [Line Items]          
Percentage of fair value in excess of carrying amount 55.00%   55.00%    
Vicinium | IPR&D intangible assets          
Finite-Lived Intangible Assets [Line Items]          
Total Intangibles $ 14,700   $ 14,700   46,400
Vicinium | IPR&D intangible assets | United States          
Finite-Lived Intangible Assets [Line Items]          
Total Intangibles 0   0   31,700
Intangibles impairment charge 31,700        
Vicinium | IPR&D intangible assets | Europe          
Finite-Lived Intangible Assets [Line Items]          
Total Intangibles $ 14,700   $ 14,700   $ 14,700