Disaggregated Revenues - Narrative (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Revenue Recognition
Non-cash royalty revenue	$ 2.2	$ 2.2
Revenue from Contract with Customer Benchmark | Product Concentration Risk | Trokendi XR
Revenue Recognition
Concentration risk percentage (more than)	43.00%	56.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | AmerisourceBergen Drug Corporation
Revenue Recognition
Concentration risk percentage (more than)	20.00%	25.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Cardinal Health
Revenue Recognition
Concentration risk percentage (more than)	20.00%	25.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | McKesson
Revenue Recognition
Concentration risk percentage (more than)	20.00%	25.00%
Revenue from Contract with Customer Benchmark | Customer Concentration Risk | Three Major Customers
Revenue Recognition
Concentration risk percentage (more than)	75.00%	85.00%