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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
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Potentially dilutive securities    
Total potentially dilutive shares 30,837,933 27,954,933
Series A Preferred Stock (convertible to Class B Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 1,418,381 4,308,812
Series B Preferred Stock (convertible to Class B Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 3,498,859 3,557,371
Series m Preferred Stock (convertible to Class A Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 1,808,498 2,037,910
Series m-2 Preferred Stock (convertible to Class B Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 160,000 826,666
Series m-4 Preferred Stock (convertible to Class A Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 0  
Series S Preferred Stock    
Potentially dilutive securities    
Total potentially dilutive shares 2,693,500 2,855,743
Warrants to purchase common stock (convertible to Class B Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 1,138,446  
Warrants to purchase Series m-3 (convertible to Class A Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 1,432,786 1,432,786
Warrants to purchase Series s (convertible to Class A Common Stock)    
Potentially dilutive securities    
Total potentially dilutive shares 4,441,814 4,441,814
Convertible Notes    
Potentially dilutive securities    
Total potentially dilutive shares 5,191,966  
Stock options    
Potentially dilutive securities    
Total potentially dilutive shares 9,053,683 8,493,831