REVENUE - Product Sales (Details) - USD ($) $ in Thousands	7 Months Ended	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues		$ 106,275	$ 229,504
CAMBIA
Disaggregation of Revenue [Line Items]
Total revenues		28,350	32,453
Zipsor
Disaggregation of Revenue [Line Items]
Total revenues		13,286	12,498
Gralise
Disaggregation of Revenue [Line Items]
Total revenues		$ 300	$ 63,100
Zyla Life Sciences
Disaggregation of Revenue [Line Items]
Product sales from acquiree	$ 7,700