FAIR VALUE - Changes in Level 3 Financial Instruments (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2019 USD ($)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Ending Balance	$ (10,058)
Significant Unobservable Inputs (Level 3)
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	(76,252)
Ending Balance	(10,058)
Significant Unobservable Inputs (Level 3) | Debt exchange derivative liability
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liability settlements	16,793
Change in fair value	1,390
Significant Unobservable Inputs (Level 3) | Contingent consideration
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liability settlements	76,644
Change in fair value	(28,633)
Significant Unobservable Inputs (Level 3) | Contingent consideration | Accounts Payable
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Liability settlements	$ 7,900