Fair Value Measurements - Summary of Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Financial assets:
Assets, Fair Value	$ 97,376	$ 120,822
US Treasury Bill Securities [Member]
Financial assets:
Assets, Fair Value		39,995
Corporate Debt Securities [Member]
Financial assets:
Assets, Fair Value	41,511	33,941
US Government Bonds [Member]
Financial assets:
Assets, Fair Value	42,345	4,060
Money Market Funds [Member]
Financial assets:
Assets, Fair Value	13,520	20,846
Commercial Paper [Member]
Financial assets:
Assets, Fair Value		21,980
Level 1 [Member]
Financial assets:
Assets, Fair Value	13,520	20,846
Level 1 [Member] | Money Market Funds [Member]
Financial assets:
Assets, Fair Value	13,520	20,846
Level 2 [Member]
Financial assets:
Assets, Fair Value	83,856	99,976
Level 2 [Member] | US Treasury Bill Securities [Member]
Financial assets:
Assets, Fair Value		39,995
Level 2 [Member] | Corporate Debt Securities [Member]
Financial assets:
Assets, Fair Value	41,511	33,941
Level 2 [Member] | US Government Bonds [Member]
Financial assets:
Assets, Fair Value	42,345	4,060
Level 2 [Member] | Commercial Paper [Member]
Financial assets:
Assets, Fair Value		21,980
Level 3 [Member]
Financial assets:
Assets, Fair Value	$ 0	$ 0