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The Company and Summary of Significant Accounting Policies - Basis of Presentation and Liquidity (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2024
USD ($)
segment
Dec. 31, 2023
USD ($)
[1]
Mar. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
The Company and Summary of Significant Accounting Policies        
Cash and cash equivalents $ 2,487 $ 2,282    
Accumulated deficit 169,050 161,458    
Stockholders' deficit $ 26,638 $ 26,634 $ 35,405 $ 43,586
Number of operating segment | segment 1      
Number of reportable segment | segment 1      
[1] The condensed balance sheet as of December 31, 2023 was derived from the audited balance sheet as of that date.