Intangible Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 81,686	$ 81,686
Accumulated Amortization	(26,577)	(21,330)
Intangible Assets, net	55,109	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	(16,875)	(13,500)
Intangible Assets, net	28,125	31,500
License and Distribution Rights | Symproic
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	30,636	30,636
Accumulated Amortization	(3,652)	(1,827)
Intangible Assets, net	$ 26,984	$ 28,809