Cash, Cash Equivalents and Investments - Summary of Cash in Foreign Accounts (Detail) - Cash [Member] - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Cash And Cash Equivalents [Line Items]
Cash in foreign accounts	$ 3,884	$ 3,909
CHINA [Member]
Cash And Cash Equivalents [Line Items]
Cash in foreign accounts	2,439	2,801
Europe [Member]
Cash And Cash Equivalents [Line Items]
Cash in foreign accounts	$ 1,445	$ 1,108