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FINANCIAL INSTRUMENTS - Narrative (Details)
1 Months Ended 3 Months Ended 6 Months Ended 12 Months Ended
Nov. 19, 2021
USD ($)
Dec. 31, 2021
USD ($)
Apr. 30, 2019
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
customer
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
segment
Concentration Risk [Line Items]                
Changes in contingent consideration           $ 22,351,000 $ 988,000  
Interest receivable   $ 100,000   $ 200,000   $ 200,000   $ 100,000
Number of major customers           3   4
Amount of allowance for doubtful accounts   0   0   $ 0   $ 0
Accounts receivable | Concentration risk by major customer | Major customer one                
Concentration Risk [Line Items]                
Concentration risk (as a percent)           34.00%   30.00%
Accounts receivable | Concentration risk by major customer | Major customer two                
Concentration Risk [Line Items]                
Concentration risk (as a percent)           17.00%   20.00%
Accounts receivable | Concentration risk by major customer | Major customer three                
Concentration Risk [Line Items]                
Concentration risk (as a percent)           17.00%   17.00%
Accounts receivable | Concentration risk by major customer | Major customer four                
Concentration Risk [Line Items]                
Concentration risk (as a percent)               11.00%
Myoscience Acquisition                
Concentration Risk [Line Items]                
Acquisition-related contingent consideration   11,200,000   2,100,000   $ 2,100,000   $ 11,200,000
Payment term     60 days          
Changes in contingent consideration       8,757,000 $ (139,000) 9,034,000 $ 988,000  
Contingent consideration     $ 100,000,000          
Contingent consideration, current       $ 43,000,000   $ 43,000,000    
Myoscience Acquisition | Contingent Consideration | Measurement Input, Discount Rate | Level 3                
Concentration Risk [Line Items]                
Measurement input, contingent consideration       0.125   0.125    
Myoscience Acquisition | Contingent Consideration | Measurement Input, Expected Milestone Payment | Level 3                
Concentration Risk [Line Items]                
Measurement input, contingent consideration       0   0    
Flexion Acquisition                
Concentration Risk [Line Items]                
Acquisition-related contingent consideration $ 425,500,000 46,400,000   $ 33,100,000   $ 33,100,000   46,400,000
Payment term 60 days              
Changes in contingent consideration $ (45,200,000) (1,200,000)   $ 12,500,000   $ 13,300,000    
Flexion Acquisition | Contingent Consideration | Measurement Input, Discount Rate | Level 3 | Weighted Average                
Concentration Risk [Line Items]                
Measurement input, contingent consideration       0.135   0.135    
Flexion Acquisition | Contingent Consideration | Measurement Input, Probability of Success of Regulatory Milestones | Level 3 | Weighted Average                
Concentration Risk [Line Items]                
Measurement input, contingent consideration       0.111   0.111    
Flexion And MyoScience Acquisition                
Concentration Risk [Line Items]                
Acquisition-related contingent consideration   $ 57,600,000   $ 35,200,000   $ 35,200,000   $ 57,600,000