Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Sep. 30, 2019
Commitments And Contingencies Disclosure [Abstract]
Accrued other long-term liabilities	$ 7.0
Estimated sales and marketing expense	$ 1.5	$ 1.3	$ 1.0
Freezing amount in cash resulted from court pending legal action issued			$ 2.6	$ 0.5
Accruals related court pending legal dispute		$ 1.5