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The Company and Summary of Significant Accounting Policies - Potentially dilutive securities that were excluded from the computation of diluted net loss per share (Details) - shares
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Potentially dilutive securities    
Total potentially dilutive shares 25,081,523 33,636,153
Series A Preferred Stock (convertible to Class B Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 1,418,381 3,086,160
Series B Preferred Stock (convertible to Class B Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 3,498,859 3,535,621
Series m Preferred Stock (convertible to Class A Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 1,779,653 1,855,328
Series m-2 Preferred Stock (convertible to Class B Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 160,000 160,000
Series S Preferred Stock (convertible to Class A Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 2,642,190 2,714,732
Warrants to purchase Class A Common Stock    
Potentially dilutive securities    
Total potentially dilutive shares 1,138,446 1,138,446
Warrants to purchase Series m-3 Preferred Stock    
Potentially dilutive securities    
Total potentially dilutive shares 1,432,786 1,432,786
Warrants to purchase Series s Preferred Stock    
Potentially dilutive securities    
Total potentially dilutive shares 2,941,814 4,441,814
Convertible Notes    
Potentially dilutive securities    
Total potentially dilutive shares   5,189,351
Employee Stock Option    
Potentially dilutive securities    
Total potentially dilutive shares 10,069,394 10,081,915