Disaggregated Revenues - Summary of Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 579,775	$ 520,397	$ 392,755
Trokendi XR
Disaggregation of Revenue [Line Items]
Total revenues	304,817	319,640	295,214
Oxtellar XR
Disaggregation of Revenue [Line Items]
Total revenues	110,708	98,725	88,186
APOKYN
Disaggregation of Revenue [Line Items]
Total revenues	99,233	74,296	0
XADAGO
Disaggregation of Revenue [Line Items]
Total revenues	13,387	6,943	0
MYOBLOC
Disaggregation of Revenue [Line Items]
Total revenues	19,514	9,746	0
Qelbree
Disaggregation of Revenue [Line Items]
Total revenues	9,879	0	0
GOCOVRI
Disaggregation of Revenue [Line Items]
Total revenues	9,778	0	0
Osmolex ER
Disaggregation of Revenue [Line Items]
Total revenues	188	0	0
Net product sales
Disaggregation of Revenue [Line Items]
Total revenues	567,504	509,350	383,400
Royalty revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 12,271	$ 11,047	$ 9,355