RESTRUCTURING CHARGES - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2020	Jun. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 268		$ 0	$ 6,787	$ 0
Accrued restructuring liability	2,900			2,900
Zyla Life Sciences
Restructuring Cost and Reserve [Line Items]
Restructuring charges	$ 268			6,787
Employee compensation costs | Zyla Life Sciences
Restructuring Cost and Reserve [Line Items]
Restructuring charges				5,100
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