Revenue - Additional Information (Detail) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Capitalized Contract Cost [Abstract]
Contract acquisition assets, estimated service period	4 years	4 years
Capitalized contract acquisition costs	$ 16,500,000	$ 10,300,000
Contract acquisition assets amortization	$ 4,500,000	$ 1,300,000