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Preferred shares - Additional information (Details) ¥ in Thousands, $ in Thousands | 1 Months Ended | 12 Months Ended | 13 Months Ended
--- | --- | --- | ---
Sep. 30, 2018 USD ($) shares | Jun. 30, 2018 USD ($) shares | Jun. 30, 2017 USD ($) shares | Jun. 30, 2017 CNY (¥) shares | Aug. 31, 2014 USD ($) shares | Sep. 30, 2013 USD ($) shares | Mar. 31, 2013 USD ($) shares | Jun. 30, 2012 CNY (¥) shares | Dec. 31, 2020 USD ($) | Dec. 31, 2018 CNY (¥) | Aug. 31, 2020 shares
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  |  |  |  |  |  | 80,000
Principal amount of convertible loans | ¥ |  |  |  |  |  |  |  |  |  | ¥ 930,436 |
Group of investors |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  |  |  |  |  | $ 125,100 |  |
Series A financing |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  |  |  | $ 700,000 |  |  |  |
Series A financing | China Best |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | ¥ |  |  |  |  |  |  |  | ¥ 1,260,000 |  |  |
Shares Issued |  |  |  |  |  |  |  | 5,660,000 |  |  |
Series A financing | K2 Evergreen Partner L.P. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  |  | 2,828,393 |  |  |  |
Series A financing | K2 Partners II L.P. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  |  | 16,970,357 |  |  |  |
Series B financing |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  |  | $ 5,564,856 |  |  |  |  |
Series B financing | Series B-1 preferred shares | K2 Evergreen Partner L.P. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 4,142,781 |  |  |  |  |
Series B financing | Series B-1 preferred shares | K2 Partners II L.P. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 8,285,562 |  |  |  |  |
Series B financing | Series B-2 preferred shares | K2 Partners II L.P. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 4,548,443 |  |  |  |  |
Series B financing | Series B-2 preferred shares | BAI Gmbh |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  |  | 18,193,772 |  |  |  |  |
Series C financing |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  |  |  | $ 23,658,593 |  |  |  |  |  |
Series C financing | Series C-1 preferred shares | BAI Gmbh |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 3,427,812 |  |  |  |  |  |
Series C financing | Series C-2 preferred shares | BAI Gmbh |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 5,643,437 |  |  |  |  |  |
Series C financing | Series C-2 preferred shares | Highland Capital Partners 9 Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 18,290,377 |  |  |  |  |  |
Series C financing | Series C-2 preferred shares | Highland Capital Partners 9-B Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 7,878,398 |  |  |  |  |  |
Series C financing | Series C-2 preferred shares | Highland Entrepreneurs? Fund 9 Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  |  |  | 1,596,503 |  |  |  |  |  |
Series C+ financing |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  |  | $ 8,682,770 |  |  |  |  |  |  |  |
Series C+ financing | K2 Partners II L.P. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 2,175,611 | 2,175,611 |  |  |  |  |  |  |
Series C+ financing | K2 Family Partners Limited |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 725,204 | 725,204 |  |  |  |  |  |  |
Series C+ financing | BAI Gmbh |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 1,450,408 | 1,450,408 |  |  |  |  |  |  |
Series C+ financing | Highland Capital Partners 9 Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 1,910,912 | 1,910,912 |  |  |  |  |  |  |
Series C+ financing | Highland Capital Partners 9-B Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 823,106 | 823,106 |  |  |  |  |  |  |
Series C+ financing | Highland Entrepreneurs? Fund 9 Limited Partnership |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 166,797 | 166,797 |  |  |  |  |  |  |
Series C+ financing | AlphaX Partners Fund I, L.P. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  |  | 5,341,517 | 5,341,517 |  |  |  |  |  |  |
Series C+ financing | Puhua |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of convertible loans | ¥ |  |  |  | ¥ 30,000 |  |  |  |  |  |  |
Number of shares issued for conversion of convertible loan |  |  | 6,261,743 | 6,261,743 |  |  |  |  |  |  |
Series C-4 financing |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Principal amount of convertible loans | $ |  | $ 6,300 |  |  |  |  |  |  |  |  |
Number of shares issued for conversion of convertible loan |  | 7,569,628 |  |  |  |  |  |  |  |  |
Series D-1 financing |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ |  | $ 23,350,000 |  |  |  |  |  |  |  |  |
Series D-1 financing | ACEE Capital Ltd. |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  | 3,592,664 |  |  |  |  |  |  |  |  |
Series D-1 financing | Honour Depot Limited |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Shares Issued |  | 6,453,887 |  |  |  |  |  |  |  |  |
Series D-2 financing | Beijing Z-Park Fund |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from share issued | $ | $ 50,000 |  |  |  |  |  |  |  |  |  |
Shares Issued | 20,630,925 |  |  |  |  |  |  |  |  |  |

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