Disaggregated Revenues - Summary of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
Disaggregation of Revenue [Line Items]
Total revenues	$ 143,644	$ 153,764
Net product sales
Disaggregation of Revenue [Line Items]
Total revenues	$ 138,461	$ 140,575
Net product sales | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	100.00%	100.00%
Qelbree
Disaggregation of Revenue [Line Items]
Total revenues	$ 45,104	$ 25,782
Qelbree | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	33.00%	18.00%
Oxtellar XR
Disaggregation of Revenue [Line Items]
Total revenues	$ 26,943	$ 28,915
Oxtellar XR | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	19.00%	21.00%
GOCOVRI
Disaggregation of Revenue [Line Items]
Total revenues	$ 26,562	$ 26,010
GOCOVRI | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	19.00%	18.00%
APOKYN
Disaggregation of Revenue [Line Items]
Total revenues	$ 16,649	$ 17,209
APOKYN | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	12.00%	12.00%
Trokendi XR
Disaggregation of Revenue [Line Items]
Total revenues	$ 15,989	$ 34,790
Trokendi XR | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	12.00%	25.00%
Other
Disaggregation of Revenue [Line Items]
Total revenues	$ 7,214	$ 7,869
Other | Revenue from Contract with Customer Benchmark | Product Concentration Risk
Disaggregation of Revenue [Line Items]
Concentration risk percentage	5.00%	6.00%
Royalty and licensing revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 5,183	$ 13,189