Nature of Business and Summary of Significant Accounting Policies - Intangible Assets with Finite Useful Lives, Amortized Over Estimated Useful Lives (Detail)	12 Months Ended
	Dec. 31, 2020
Licenses
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	15 years
BELBUCA license and distribution rights
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	10 years
Symproic license and distribution rights
Finite-Lived Intangible Assets [Line Items]
Estimated useful lives	12 years