The Company and Summary of Significant Accounting Policies - Liquidity and Going Concern (Detail) $ in Thousands	Nov. 09, 2022	Sep. 30, 2022 USD ($)	Aug. 31, 2022 employee	Dec. 31, 2021 USD ($)
The Company and Summary of Significant Accounting Policies
Accumulated deficit | $		$ 231,719		$ 217,602
Cash and cash equivalents | $		$ 16,947		$ 33,892
Number of employees terminated			9
Number of employees			18
Employee reduction (as a percentage)			50.00%
Number of non-terminated employees			5
Subsequent Event
The Company and Summary of Significant Accounting Policies
Stock split ratio	15