INTANGIBLE ASSETS AND GOODWILL (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Goodwill	$ 13,064	$ 13,064
Vicinium | IPR&D intangible assets
Finite-Lived Intangible Assets [Line Items]
Total Intangibles	46,400	46,400
Vicinium | IPR&D intangible assets | United States
Finite-Lived Intangible Assets [Line Items]
Total Intangibles	31,700	31,700
Vicinium | IPR&D intangible assets | Europe
Finite-Lived Intangible Assets [Line Items]
Total Intangibles	$ 14,700	$ 14,700