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Convertible Preferred Shares - Issuances of convertible preferred shares (Details)
12 Months Ended 24 Months Ended
Dec. 31, 2019
$ / shares
shares
Dec. 31, 2018
shares
Convertible Preferred Shares    
Conversion ratio for each Convertible Preferred Share into each Ordinary Share 1  
Series A1 convertible preferred shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.0093  
Number of Shares 71,849,380  
Series A2 convertible preferred shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.0336  
Number of Shares 238,419,800  
Series B1 convertible preferred shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.1576  
Number of Shares 211,588,720  
Series B2 convertible preferred shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.1576  
Number of Shares 27,781,280  
Series B3 convertible preferred shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.1576  
Number of Shares 145,978,540  
Series B4 Convertible Preferred Shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.1710  
Number of Shares 292,414,780  
Series C1 convertible preferred shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.3545  
Number of Shares 56,430,180  
C2 Convertible Preferred Shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.3985  
Number of Shares 238,260,780  
Series C3 convertible preferred shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 0.4139  
Number of Shares 241,604,260  
Series D Convertible Preferred Shares    
Convertible Preferred Shares    
Original Issuance Price per Share | $ / shares $ 2.4832  
Number of Shares 551,174,340  
Stock split ratio of Convertible Preferred Shares 0.05  
Conversion of stock, shares issued   0