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INTANGIBLE ASSETS AND GOODWILL - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Intangible assets
Loss on impairment of intangible assets	$ 238,831	$ 0	$ 238,831	$ 0
Amortization expense	10,184	$ 7,969	$ 22,752	$ 24,438
Spectrum Pharmaceuticals, Inc.
Intangible assets
Goodwill acquired during period	$ 19,900

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