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FAIR VALUE MEASUREMENTS - Contingent Consideration (Details) - USD ($)
3 Months Ended 12 Months Ended
Jun. 30, 2018
Dec. 31, 2018
Dec. 31, 2019
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Accrued expenses   $ 129,537,000 $ 177,079,000
Endoceutics License Agreement      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Accrued expenses   0 $ 0
Contingent Consideration      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Adjustments to fair value of contingent consideration $ 49,800,000 $ 49,600,000