Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Revenue Recognition
Total revenues	$ 100,446	$ 102,140	$ 104,695	$ 85,474	$ 115,934	$ 102,996	$ 99,538	$ 90,429	$ 392,755	$ 408,897	$ 302,238
Noncash royalty revenue									6,927	5,914	5,283
Net product sales
Revenue Recognition
Total revenues									383,400	399,871	294,097
Trokendi XR
Revenue Recognition
Total revenues									295,214	315,295	226,518
Oxtellar XR
Revenue Recognition
Total revenues									88,186	84,576	67,579
Royalty revenue
Revenue Recognition
Total revenues									9,355	8,276	6,367
Licensing revenue
Revenue Recognition
Total revenues									$ 0	$ 750	$ 1,774
Customer Concentration Risk | Revenues
Revenue Recognition
Concentration risk percentage									98.00%	98.00%	97.00%
Customer Concentration Risk | Revenues | Trokendi XR
Revenue Recognition
Concentration risk percentage									70.00%	70.00%	70.00%