Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	9 Months Ended
	Sep. 30, 2020	Sep. 30, 2020	Dec. 31, 2019
Finite Lived Intangible Assets [Line Items]
Change in goodwill	$ 0	$ 0
Goodwill	$ 3,332,000	3,332,000	$ 3,332,000
Increase (decrease) in cost of intangible assets		$ 100,000
Minimum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives		1 year
Maximum [Member]
Finite Lived Intangible Assets [Line Items]
Amortization of intangible assets basis over estimated useful lives		6 years