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Convertible redeemable preferred shares - Issuances (Details) |  |  |  |  |  |  |  |  | 1 Months Ended
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Oct. 27, 2020 ¥ / shares shares | Oct. 27, 2020 $ / shares shares | Aug. 12, 2019 $ / shares shares | Jun. 05, 2019 $ / shares shares | Aug. 06, 2018 ¥ / shares shares | Jul. 03, 2018 ¥ / shares shares | Jul. 03, 2018 $ / shares shares | Dec. 27, 2017 ¥ / shares shares | Aug. 14, 2017 ¥ / shares shares | May 18, 2017 ¥ / shares shares | Nov. 30, 2023 $ / shares shares | Oct. 31, 2022 $ / shares shares | Oct. 31, 2020 ¥ / shares shares | Oct. 31, 2020 $ / shares shares | Aug. 31, 2019 $ / shares shares | Jun. 30, 2019 $ / shares shares | Aug. 31, 2018 ¥ / shares shares | Jul. 31, 2018 ¥ / shares shares | Jul. 31, 2018 $ / shares shares | Dec. 31, 2017 ¥ / shares shares | Aug. 31, 2017 ¥ / shares shares | May 31, 2017 ¥ / shares shares | Apr. 30, 2016 ¥ / shares shares
Series A Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | ¥ / shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | ¥ 0.3078
Number of shares issued |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 58,480,000
Series A+ Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | ¥ / shares |  |  |  |  |  |  |  |  |  | ¥ 0.3420 |  |  |  |  |  |  |  |  |  |  |  | ¥ 0.3420 |
Number of shares issued |  |  |  |  |  |  |  |  |  | 84,480,000 |  |  |  |  |  |  |  |  |  |  |  | 84,480,000 |
Series B Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | ¥ / shares |  |  |  |  |  |  |  |  | ¥ 0.3848 |  |  |  |  |  |  |  |  |  |  |  | ¥ 0.3848 |  |
Number of shares issued |  |  |  |  |  |  |  |  | 649,760,000 |  |  |  |  |  |  |  |  |  |  |  | 649,760,000 |  |
Series B+ Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | ¥ / shares |  |  |  |  |  |  |  | ¥ 0.6733 |  |  |  |  |  |  |  |  |  |  |  | ¥ 0.6733 |  |  |
Number of shares issued |  |  |  |  |  |  |  | 277,730,000 |  |  |  |  |  |  |  |  |  |  |  | 277,730,000 |  |  |
Series C1 Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | (per share) |  |  |  |  |  | ¥ 0.9334 | $ 0.1404 |  |  |  |  |  |  |  |  |  |  | ¥ 0.9334 | $ 0.1404 |  |  |  |
Number of shares issued |  |  |  |  |  | 604,820,600 | 604,820,600 |  |  |  |  |  |  |  |  |  |  | 604,820,600 | 604,820,600 |  |  |  |
Series C2 Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | ¥ / shares |  |  |  |  | ¥ 0.9334 |  |  |  |  |  |  |  |  |  |  |  | ¥ 0.9334 |  |  |  |  |  |
Number of shares issued |  |  |  |  | 289,379,800 |  |  |  |  |  |  |  |  |  |  |  | 289,379,800 |  |  |  |  |  |
Series D1 Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | $ / shares |  |  |  | $ 0.1899 |  |  |  |  |  |  |  |  |  |  |  | $ 0.1899 |  |  |  |  |  |  |
Number of shares issued |  |  |  | 705,523,600 |  |  |  |  |  |  |  |  |  |  |  | 705,523,600 |  |  |  |  |  |  |
Series D2 Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | $ / shares |  |  | $ 0.1899 |  |  |  |  |  |  |  |  |  |  |  | $ 0.1899 |  |  |  |  |  |  |  |
Number of shares issued |  |  | 105,302,000 |  |  |  |  |  |  |  |  |  |  |  | 105,302,000 |  |  |  |  |  |  |  |
Series E Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | (per share) | ¥ 2.3119 | $ 0.3425 |  |  |  |  |  |  |  |  |  |  | ¥ 2.3119 | $ 0.3425 |  |  |  |  |  |  |  |  |
Number of shares issued | 803,222,500 | 803,222,500 |  |  |  |  |  |  |  |  |  |  | 803,222,500 | 803,222,500 |  |  |  |  |  |  |  |  |
Series F Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Convertible redeemable preferred shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Issue price per share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 0.5659 | $ 0.5659 |  |  |  |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  |  |  |  |  | 392,013,413 | 392,013,413 |  |  |  |  |  |  |  |  |  |  |

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