Goodwill and Intangible Assets - Additional Information (Detail) - USD ($)	3 Months Ended	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible assets amortization expense		$ 2,900,000	$ 900,000
Impairment loss of intangible assets	$ 400,000			$ 400,000
Impairment of goodwill		$ 0	$ 0