Quarterly report pursuant to Section 13 or 15(d)

Condensed Consolidated Balance Sheets (Parentheticals)

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Condensed Consolidated Balance Sheets (Parentheticals)
$ in Thousands
Jun. 30, 2024
USD ($)
$ / shares
shares
Jun. 30, 2024
¥ / shares
Dec. 31, 2023
USD ($)
$ / shares
shares
Dec. 31, 2023
¥ / shares
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares) 50,000,000   50,000,000  
Preferred stock, shares outstanding (in shares) 0   0  
Common stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Common stock, shares authorized (in shares) 800,000,000   800,000,000  
Common stock, shares outstanding (in shares) 3,307,872   171,677  
Series A Preferred Stock        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001      
Preferred stock, shares authorized (in shares) 300   300  
Preferred stock, shares outstanding (in shares) 0   251  
Preferred stock, liquidation preference, value | $ $ 0   $ 261  
Series B Preferred Stock        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares) 1,500   1,500  
Preferred stock, shares outstanding (in shares) 0   1,443  
Preferred stock, liquidation preference, value | $ $ 0   $ 1,501  
Series C Preferred Stock        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares) 600,000   600,000  
Preferred stock, shares outstanding (in shares) 0   500,756  
Preferred stock, liquidation preference, value | $ $ 0   $ 531  
Series D Preferred Stock        
Preferred stock, par value (in dollars per share) | ¥ / shares   ¥ 0.0001   ¥ 0.0001
Preferred stock, shares authorized (in shares) 7,000   7,000  
Preferred stock, shares outstanding (in shares) 0   0  
Number of Preferred Stock Shares Converted 0   0  
Preferred stock, liquidation preference, value | $ $ 0   $ 0  
Series E preferred stock        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares) 77,000   77,000  
Preferred stock, shares outstanding (in shares) 0   0  
Number of Preferred Stock Shares Converted 0   0  
Series F preferred stock        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares) 9,073   9,073  
Preferred stock, shares outstanding (in shares) 0   4,448  
Preferred stock, liquidation preference, value | $ $ 0   $ 4,753  
Series F-1 Preferred Stock        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares) 9,052   9,052  
Preferred stock, shares outstanding (in shares) 0   653  
Preferred stock, liquidation preference, value | $ $ 0   $ 696  
Series F-2 Preferred Stock        
Preferred stock, par value (in dollars per share) | $ / shares $ 0.0001   $ 0.0001  
Preferred stock, shares authorized (in shares) 9,052   9,052  
Preferred stock, shares outstanding (in shares) 0   1,153  
Preferred stock, liquidation preference, value | $ $ 0   $ 1,371