Disaggregated Revenues - Summary of Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Disaggregation of Revenue [Line Items]
Total revenues	$ 155,135	$ 102,140	$ 376,840	$ 292,309
Trokendi XR
Disaggregation of Revenue [Line Items]
Total revenues	82,906	77,332	241,131	219,989
Oxtellar XR
Disaggregation of Revenue [Line Items]
Total revenues	28,364	22,702	75,983	65,502
APOKYN
Disaggregation of Revenue [Line Items]
Total revenues	34,482	0	43,082	0
XADAGO
Disaggregation of Revenue [Line Items]
Total revenues	2,331	0	3,132	0
MYOBLOC
Disaggregation of Revenue [Line Items]
Total revenues	4,050	0	5,279	0
Net product sales
Disaggregation of Revenue [Line Items]
Total revenues	152,133	100,034	368,607	285,491
Royalty revenues
Disaggregation of Revenue [Line Items]
Total revenues	$ 3,002	$ 2,106	$ 8,233	$ 6,818