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The Company and Summary of Significant Accounting Policies - Basis of Presentation and Liquidity (Details)
$ in Thousands
 1 Months Ended 12 Months Ended
Sep. 29, 2023
USD ($)
Aug. 18, 2023
USD ($)
Feb. 09, 2023
USD ($)
Feb. 01, 2023
USD ($)
Jan. 26, 2022
USD ($)
shares
Apr. 30, 2022
USD ($)
Dec. 31, 2023
USD ($)
segment
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
The Company and Summary of Significant Accounting Policies                  
Cash and cash equivalents             $ 2,282 $ 4,810  
Accumulated deficit             (161,500)    
Working capital             (1,300)    
Accumulated deficit             161,458 139,340  
Stockholders' deficit             26,634 43,586 $ 82,933
Proceeds from equity sale, net of issuance costs (in shares) | shares         2,236,619        
Proceeds for the issuance of convertible notes, net of issuance costs               3,157  
Proceeds from equity sale, net of issuance costs         $ 20,200        
Committed equity facility           $ 100,000      
Proceeds from equity sale, net of issuance costs             $ 25,918 2,879  
Number of operating segment | segment             1    
Cash and cash equivalent balances exceeding FDIC insured limits             $ 2,100 $ 4,600  
Number of reportable segment | segment             1    
Class A Common Stock                  
The Company and Summary of Significant Accounting Policies                  
Proceeds from equity sale, net of issuance costs $ 10,000                
Committed equity facility       $ 20,000          
Proceeds from equity sale, net of issuance costs   $ 25,000 $ 20,000