Other Intangible Assets - Summary of Other Intangible Assets Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 81,686	$ 81,686
Accumulated Amortization	(28,310)	(21,330)
Intangible Assets, net	53,376	60,356
Product rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	6,050	6,050
Accumulated Amortization	(6,050)	(6,003)
Intangible Assets, net	0	47
License and Distribution Rights | BELBUCA
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	45,000	45,000
Accumulated Amortization	(18,000)	(13,500)
Intangible Assets, net	27,000	31,500
License and Distribution Rights | Symproic
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	30,636	30,636
Accumulated Amortization	(4,260)	(1,827)
Intangible Assets, net	$ 26,376	$ 28,809
Weighted Average
Finite-Lived Intangible Assets [Line Items]
Weighted average Useful Life	7 years 11 months 8 days	8 years 3 months 18 days
Weighted Average | Product rights
Finite-Lived Intangible Assets [Line Items]
Weighted average Useful Life		29 days
Weighted Average | License and Distribution Rights | BELBUCA
Finite-Lived Intangible Assets [Line Items]
Weighted average Useful Life	6 years	7 years
Weighted Average | License and Distribution Rights | Symproic
Finite-Lived Intangible Assets [Line Items]
Weighted average Useful Life	10 years 9 months 18 days	11 years 9 months 29 days