401(K) Plan - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Retirement Benefits [Abstract]
401(k)			Postemployment Retirement Benefits [Member]
Expense incurred related to plan	$ 0.4	$ 0.1	$ 1.2	$ 0.6