Other Intangible Assets - Summary of Other Intangible Assets Net (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 83,586	$ 52,950
Accumulated Amortization	(23,230)	(16,247)
Intangible assets, net	60,356	36,703
Product Rights
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	6,050	6,050
Accumulated Amortization	(6,003)	(5,442)
Intangible assets, net	47	608
License and Distribution Rights | BELBUCA
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	45,000	45,000
Accumulated Amortization	(13,500)	(9,000)
Intangible assets, net	31,500	36,000
License and Distribution Rights | Symproic
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	30,636
Accumulated Amortization	(1,827)
Intangible assets, net	28,809
Licenses
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,900	1,900
Accumulated Amortization	(1,900)	(1,805)
Intangible assets, net	$ 0	$ 95
Weighted average useful life	15 years
Weighted Average | Product Rights
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	7 months 9 days	1 year 29 days
Weighted Average | License and Distribution Rights | BELBUCA
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	3 years 9 months 7 days	7 years 7 months 24 days
Weighted Average | License and Distribution Rights | Symproic
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	4 years 4 months 24 days
Weighted Average | Licenses
Finite-Lived Intangible Assets [Line Items]
Weighted average useful life	3 months 18 days	6 months