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FINANCIAL INSTRUMENTS - Narrative (Details)	1 Months Ended	3 Months Ended		6 Months Ended		12 Months Ended
	Apr. 30, 2019 USD ($)	Jun. 30, 2023 USD ($)	Jun. 30, 2022 USD ($)	Jun. 30, 2023 USD ($) wholesaler	Jun. 30, 2022 USD ($)	Dec. 31, 2022 USD ($) wholesaler	Nov. 30, 2021 USD ($)
Concentration Risk [Line Items]
Changes in contingent consideration				$ (6,640,000)	$ (22,351,000)
Interest receivable		$ 900,000		$ 900,000		$ 800,000
Number of major customers | wholesaler				3		3
Amount of allowance for doubtful accounts		0		$ 0		$ 0
Accounts Receivable | Concentration Risk By Major Customer | Major Customer One
Concentration Risk [Line Items]
Concentration risk (as a percent)				36.00%		34.00%
Accounts Receivable | Concentration Risk By Major Customer | Major Customer Two
Concentration Risk [Line Items]
Concentration risk (as a percent)				21.00%		19.00%
Accounts Receivable | Concentration Risk By Major Customer | Major Customer Three
Concentration Risk [Line Items]
Concentration risk (as a percent)				15.00%		18.00%
Flexion And MyoScience Acquisition
Concentration Risk [Line Items]
Acquisition-related contingent consideration		21,500,000		$ 21,500,000		$ 28,100,000
Flexion Acquisition
Concentration Risk [Line Items]
Acquisition-related contingent consideration		425,500,000		$ 425,500,000			$ 372,300,000
Payment term				60 days
Changes in contingent consideration		18,300,000	$ 12,500,000	$ 6,600,000	13,300,000
Contingent consideration		$ 21,500,000		$ 21,500,000		28,100,000
Flexion Acquisition | Weighted Average | Contingent Consideration | Level 3 | Measurement Input, Discount Rate
Concentration Risk [Line Items]
Measurement input, contingent consideration		0.102		0.102
Flexion Acquisition | Weighted Average | Contingent Consideration | Level 3 | Measurement Input, Probability of Success of Regulatory Milestones
Concentration Risk [Line Items]
Measurement input, contingent consideration		0.125		0.125
Myoscience Acquisition
Concentration Risk [Line Items]
Acquisition-related contingent consideration		$ 0		$ 0		$ 0
Payment term	60 days
Changes in contingent consideration		0	$ 8,757,000	0	$ 9,034,000
Contingent consideration	$ 100,000,000
Contingent consideration, current		$ 43,000,000		$ 43,000,000
Myoscience Acquisition | Contingent Consideration | Level 3 | Measurement Input, Expected Milestone Payment
Concentration Risk [Line Items]
Measurement input, contingent consideration		0		0

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