Disaggregated Revenues - Schedule of Percentage of Net Product Sales to Total Net Product Sales (Details) - Percentage of Gross Product Sales - Product Concentration Risk	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Net product sales
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%	100.00%
Qelbree
Disaggregation of Revenue [Line Items]
Concentration risk percentage	38.00%	24.00%	9.00%
GOCOVRI
Disaggregation of Revenue [Line Items]
Concentration risk percentage	20.00%	21.00%	16.00%
Oxtellar XR
Disaggregation of Revenue [Line Items]
Concentration risk percentage	16.00%	20.00%	18.00%
APOKYN
Disaggregation of Revenue [Line Items]
Concentration risk percentage	12.00%	13.00%	12.00%
Trokendi XR
Disaggregation of Revenue [Line Items]
Concentration risk percentage	10.00%	16.00%	40.00%
Other
Disaggregation of Revenue [Line Items]
Concentration risk percentage	4.00%	6.00%	5.00%