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The Company and Summary of Significant Accounting Policies - Basis of Presentation and Liquidity (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
[1]
Mar. 31, 2022
Dec. 31, 2021
Basis of Presentation and Liquidity        
Cash and cash equivalents $ 2,375 $ 4,810    
Accumulated deficit 141,784 139,340    
Stockholders' deficit $ 35,405 $ 43,586 $ 38,674 $ 82,933
[1] The condensed consolidated balance sheet as of December 31, 2022 was derived from the audited consolidated balance sheet as of that date.