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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

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