Revenue (Detail) - USD ($)		3 Months Ended		9 Months Ended
	Jan. 25, 2021	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Revenue from Contract with Customer [Abstract]
License revenue	$ 7,500,000	$ 0	$ 0	$ 7,500,000	$ 0