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FAIR VALUE - Narrative (Details)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
Rate
Sep. 30, 2022
USD ($)
Jul. 31, 2023
USD ($)
$ / shares
Dec. 31, 2022
USD ($)
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Change in fair value of contingent consideration $ (17,532) $ 3,900 $ (8,124) $ 6,845    
Short-term contingent consideration 12,800   12,800     $ 26,300
Long-term contingent consideration 16,100   16,100     22,200
Derivative liability 764   764     252
Recurring            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Short-term contingent consideration 12,800   12,800     26,300
Long-term contingent consideration 16,100   16,100     22,200
Derivative liability 764   764     252
Level 3            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Change in fair value of contingent consideration recorded within costs and expenses 512   512      
Level 3 | Recurring            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Short-term contingent consideration 12,800   12,800     26,300
Long-term contingent consideration 16,100   16,100     22,200
Derivative liability 764   764     252
Level 2            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Debt conversion option value 41,800   41,800     92,500
Convertible notes, par value 40,000   40,000     70,000
Level 2 | Recurring            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Short-term contingent consideration 0   0     0
Long-term contingent consideration 0   0     0
Derivative liability $ 0   $ 0     0
Revenue Volatility            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Contingent consideration, measurement input 0.30   0.30      
Discount Rate            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Contingent consideration, measurement input 0.180   0.180      
Discounted Cash Flow | Discount Rate            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Contingent consideration, measurement input 0.085   0.085      
Discounted Cash Flow | Credit Spread            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Contingent consideration, measurement input 0.038   0.038      
Spectrum Pharmaceuticals, Inc.            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Business acquisition, contingent consideration, per share, maximum (in dollars per share) | $ / shares         $ 0.20  
Contingent consideration $ 0   $ 0   $ 3,932  
Change in fair value of contingent consideration 3,900   3,900      
INDOCIN            
Schedule of Cash and Cash Equivalents and Marketable Securities [Line Items]            
Contingent consideration 28,900   28,900     48,500
Contingent payment consideration, future royalties covenant, product net sales (over)     $ 20,000      
Contingent consideration, royalty percentage | Rate     20.00%      
Short-term contingent consideration 12,800   $ 12,800     26,300
Long-term contingent consideration $ 16,100   $ 16,100     $ 22,200