Disaggregated Revenues - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Revenue Recognition
Noncash royalty revenue	$ 8,500	$ 6,900	$ 5,900
Estimated adjustment for product returns related to prior year sales	13,800	(400)
Total revenues	520,397	392,755	408,897
Trokendi XR
Revenue Recognition
Estimated adjustment for product returns related to prior year sales	10,700
Total revenues	319,640	295,214	315,295
Net product sales
Revenue Recognition
Total revenues	$ 509,350	$ 383,400	$ 399,871
Revenue from Contract with Customer Benchmark | Product Concentration Risk | Trokendi XR
Revenue Recognition
Concentration risk percentage (more than)	60.00%	70.00%	70.00%