Disaggregated Revenues - Summary of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 126,729	$ 104,695	$ 221,705	$ 190,169
Trokendi XR
Disaggregation of Revenue [Line Items]
Total revenues	89,674	78,964	158,225	142,657
Oxtellar XR
Disaggregation of Revenue [Line Items]
Total revenues	23,680	23,394	47,619	42,800
APOKYN
Disaggregation of Revenue [Line Items]
Total revenues	8,600	0	8,600	0
XADAGO
Disaggregation of Revenue [Line Items]
Total revenues	801	0	801	0
MYOBLOC
Disaggregation of Revenue [Line Items]
Total revenues	1,229	0	1,229	0
Net product sales
Disaggregation of Revenue [Line Items]
Total revenues	123,984	102,358	216,474	185,457
Royalty revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 2,745	$ 2,337	$ 5,231	$ 4,712