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Convertible Preferred Shares - Issuances of convertible preferred shares (Details) | 12 Months Ended | 24 Months Ended
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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

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