Disaggregated Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Non-cash royalty revenue	$ 2.5	$ 2.4	$ 7.2	$ 6.8
Revenue from Contract with Customer Benchmark | Product Concentration Risk | Trokendi XR
Disaggregation of Revenue [Line Items]
Concentration risk percentage (more than)	40.00%	56.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Three Major Customers
Disaggregation of Revenue [Line Items]
Concentration risk percentage (more than)			80.00%	85.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | AmerisourceBergen Drug Corporation
Disaggregation of Revenue [Line Items]
Concentration risk percentage (more than)			25.00%	25.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Cardinal Health
Disaggregation of Revenue [Line Items]
Concentration risk percentage (more than)			25.00%	25.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | McKesson
Disaggregation of Revenue [Line Items]
Concentration risk percentage (more than)			25.00%	25.00%