Income Taxes - Changes in Valuation Allowance for Deferred Tax Assets (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Valuation allowance as of beginning of year	$ 27,799	$ 38,487
Decreases recorded as benefit to income tax provision		(10,688)
Increases recorded to income tax provision	18,888
Valuation allowance as of end of year	$ 46,687	$ 27,799