Disaggregated Revenues - Summary of Revenues (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disaggregation of Revenue [Line Items]
Total revenues	$ 520,397	$ 392,755	$ 408,897
Trokendi XR
Disaggregation of Revenue [Line Items]
Total revenues	319,640	295,214	315,295
Oxtellar XR
Disaggregation of Revenue [Line Items]
Total revenues	98,725	88,186	84,576
APOKYN
Disaggregation of Revenue [Line Items]
Total revenues	74,296	0	0
XADAGO
Disaggregation of Revenue [Line Items]
Total revenues	6,943	0	0
MYOBLOC
Disaggregation of Revenue [Line Items]
Total revenues	9,746	0	0
Net product sales
Disaggregation of Revenue [Line Items]
Total revenues	509,350	383,400	399,871
Royalty revenue
Disaggregation of Revenue [Line Items]
Total revenues	11,047	9,355	8,276
Licensing revenue
Disaggregation of Revenue [Line Items]
Total revenues	$ 0	$ 0	$ 750