Severance and Retention - Summary of Severance Related Liabilities within Accounts Payable and Accrued Expense (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Restructuring And Related Activities [Abstract]
Balance at beginning of year	$ 1,466	$ 358
Payments	(2,228)	(1,395)
Expense	1,205	2,503
Balance at ending of year	$ 443	$ 1,466