The Company and Summary of Significant Accounting Policies - Liquidity and Going Concern (Detail) $ in Thousands	Aug. 02, 2022 employee	Jun. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)
The Company and Summary of Significant Accounting Policies
Accumulated deficit | $		$ 225,308	$ 217,602
Cash and cash equivalents | $		$ 22,890	$ 33,892
Subsequent Event [Member]
The Company and Summary of Significant Accounting Policies
Number of employees terminated	10
Number of employees	18
Employee reduction (as a percentage)	55.50%
Number of non-terminated employees	4