Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Revenue Recognition
Total revenue	$ 115,934	$ 102,996	$ 99,538	$ 90,429	$ 88,435	$ 80,398	$ 75,829	$ 57,576	$ 408,897	$ 302,238	$ 215,003
Non-cash royalty revenue									(5,914)	(5,283)	(4,686)
Product
Revenue Recognition
Total revenue									399,871	294,097	210,078
Trokendi XR
Revenue Recognition
Total revenue									315,295	226,518	158,384
Oxtellar XR
Revenue Recognition
Total revenue									84,576	67,579	51,694
Royalty
Revenue Recognition
Total revenue									8,276	6,367	4,686
Licensing
Revenue Recognition
Total revenue									750	1,774	$ 239
Milestone Revenue
Revenue Recognition
Total revenue									$ 750	$ 1,500