Cash Equivalents and Short-Term Investments Classified as Available-for-sale Debt Securities (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 34,817	$ 46,851
Estimated Fair Value	34,817	46,851
Money Market Funds | Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	34,817	44,347
Estimated Fair Value	34,817	44,347
Cash and Cash Equivalents
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value	$ 34,817	44,347
U.S. Government Agency Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost		2,504
Estimated Fair Value		2,504
Short-Term Investments
Schedule Of Available For Sale Securities [Line Items]
Estimated Fair Value		$ 2,504