RESTRUCTURING CHARGES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 6,519	$ 0	$ 6,519	$ 0
Accrued restructuring liability	5,300		5,300
Zyla Life Sciences
Restructuring Cost and Reserve [Line Items]
Restructuring charges	6,519		$ 6,519
Employee compensation costs | Zyla Life Sciences
Restructuring Cost and Reserve [Line Items]
Restructuring charges	4,800
Employee compensation costs | COVID-19 Pandemic
Restructuring Cost and Reserve [Line Items]
Restructuring charges	600
Equity modifications | Zyla Life Sciences
Restructuring Cost and Reserve [Line Items]
Restructuring charges	1,000
Other exit costs | Zyla Life Sciences
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 100
2019 Cost Savings Initiative | Employee compensation costs
Restructuring Cost and Reserve [Line Items]
Restructuring charges					$ 3,900