Revenue Recognition - Disaggregated Revenue By Major Products (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Disaggregation of Revenue [Line Items]
Revenues	$ 88,122	$ 122,238	$ 146,254	$ 117,387	$ 128,525	$ 124,331	$ 130,371	$ 112,541	$ 474,002	$ 495,769	$ 432,487
Makena
Disaggregation of Revenue [Line Items]
Revenues									322,265	387,158	334,050
Feraheme
Disaggregation of Revenue [Line Items]
Revenues									135,001	105,930	97,058
Intrarosa
Disaggregation of Revenue [Line Items]
Revenues									16,218	1,816	0
MuGard
Disaggregation of Revenue [Line Items]
Revenues									368	741	1,062
Product
Disaggregation of Revenue [Line Items]
Revenues									$ 473,852	$ 495,645	$ 432,170