Other Intangible Assets - Summary of Other Intangible Assets Net Consisting of Product Rights and Licenses (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 83,586	$ 52,950
Accumulated Amortization	(19,433)	(16,247)
Intangible Assets, net	30,636	36,703
Product Rights [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	6,050	6,050
Accumulated Amortization	(5,723)	(5,442)
Intangible Assets, net	327	608
License and Distribution Rights [Member] | Belbuca [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	45,000	45,000
Accumulated Amortization	(11,250)	(9,000)
Intangible Assets, net	33,750	36,000
License and Distribution Rights [Member] | Symproic [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	30,636
Accumulated Amortization	(609)
Intangible Assets, net	30,027
Licenses [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	1,900	1,900
Accumulated Amortization	(1,851)	(1,805)
Intangible Assets, net	$ 49	$ 95