Intangible Assets - Schedule of Intangible Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 11,495	$ 3,661
Accumulated Amortization	(3,802)	(3,183)
Net Book Value	$ 7,693	478
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Capitalized cost being amortized over periods	5 years
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Capitalized cost being amortized over periods	10 years
Nocdurna Product Rights [Member]
Finite Lived Intangible Assets [Line Items]
Capitalized cost being amortized over periods	10 years
Gross Carrying Amount	$ 7,500
Accumulated Amortization	(188)
Net Book Value	7,312
Patents
Finite Lived Intangible Assets [Line Items]
Gross Carrying Amount	3,995	3,661
Accumulated Amortization	(3,614)	(3,183)
Net Book Value	$ 381	$ 478
Patents | Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Capitalized cost being amortized over periods	5 years
Patents | Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Capitalized cost being amortized over periods	10 years