REVENUE RECOGNITION - Disaggregated Revenue By Major Products (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 89,707	$ 84,131	$ 78,109	$ 75,804	$ 88,122	$ 122,238	$ 146,254	$ 117,387	$ 327,751	$ 474,002	$ 495,769
Makena
Disaggregation of Revenue [Line Items]
Revenues									122,064	322,265	387,158
Feraheme
Disaggregation of Revenue [Line Items]
Revenues									167,947	135,001	105,930
Intrarosa
Disaggregation of Revenue [Line Items]
Revenues									21,417	16,218	1,816
Other
Disaggregation of Revenue [Line Items]
Revenues									(238)	368	741
Product sales, net
Disaggregation of Revenue [Line Items]
Revenues									$ 311,190	$ 473,852	$ 495,645