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Convertible Redeemable Preferred Shares - Summary of Issuance of Convertible Redeemable Preferred Shares (Details) $ / shares in Units, ¥ in Thousands, $ in Thousands |  |  |  |  |  | 1 Months Ended | 3 Months Ended | 4 Months Ended | 12 Months Ended | 50 Months Ended |  |
--- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | ---
Sep. 14, 2020 USD ($) $ / shares shares | Jun. 03, 2019 USD ($) $ / shares shares | Dec. 07, 2018 CNY (¥) shares | Jul. 05, 2018 USD ($) $ / shares shares | Jun. 26, 2018 USD ($) $ / shares shares | May 25, 2021 USD ($) $ / shares shares | Sep. 16, 2019 USD ($) $ / shares shares | May 25, 2021 CNY (¥) shares | Dec. 31, 2021 CNY (¥) shares | Nov. 11, 2016 USD ($) $ / shares shares | Dec. 07, 2018 $ / shares | Aug. 31, 2012 $ / shares
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  |  |  |  | 11,731,035 |  |  |
Proceeds from Issuance | ¥ |  |  |  |  |  |  |  |  | ¥ 1,138,232 |  |  |
Series A, B, C-1, C-2 Convertible Redeemable Preferred Shares | Issuance Date, August 31, 2012 to November 11, 2016 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  |  |  |  |  | 44,887,552 |  |
Proceeds from Issuance | $ |  |  |  |  |  |  |  |  |  | $ 63,902 |  |
Series A, B, C-1, C-2 Convertible Redeemable Preferred Shares | Issuance Date, August 31, 2012 to November 11, 2016 | Minimum |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  |  |  |  |  |  |  |  | $ 0.21
Series A, B, C-1, C-2 Convertible Redeemable Preferred Shares | Issuance Date, August 31, 2012 to November 11, 2016 | Maximum |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  |  |  |  |  |  | $ 2.65 |  |
Series C-3 Convertible Redeemable Preferred Shares | Issuance Date, June 26, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  | 1,884,512 |  |  |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  | $ 2.65 |  |  |  |  |  |  |
Proceeds from Issuance | $ |  |  |  |  | $ 5,000 |  |  |  |  |  |  |
Series C-3 Convertible Redeemable Preferred Shares | Issuance Date, December 7, 2018 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  | 7,819,871 |  |  |  |  |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  |  |  |  |  |  |  | $ 2.65 |
Proceeds from Issuance | ¥ |  |  | ¥ 138,688 |  |  |  |  |  |  |  |  |
Series C-3 Convertible Redeemable Preferred Shares | Issuance Date, February 8, 2021 to May 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  |  |  | 10,906,031 |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  |  | $ 2.65 |  |  |  |  |  |
Proceeds from Issuance | ¥ |  |  |  |  |  |  |  | ¥ 192,122 |  |  |  |
Series D Convertible Redeemable Preferred Shares | Issuance Date, July 5, 2018 with Issue Price $10.83 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  | 2,115,755 |  |  |  |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  | $ 10.83 |  |  |  |  |  |  |  |
Proceeds from Issuance | $ |  |  |  | $ 22,917 |  |  |  |  |  |  |  |
Series D Convertible Redeemable Preferred Shares | Issuance Date, July 5, 2018 with Issue Price $12.74 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  | 7,952,405 |  |  |  |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  | $ 12.74 |  |  |  |  |  |  |  |
Proceeds from Issuance | $ |  |  |  | $ 101,340 |  |  |  |  |  |  |  |
Series E Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  |  |  |  | 1,953,652 |  |  |
Series E Convertible Redeemable Preferred Shares | Issuance Date, June 3 to September 16, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  |  | 2,521,844 |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  |  |  | $ 17.84 |  |  |  |  |
Proceeds from Issuance | $ |  |  |  |  |  |  | $ 45,000 |  |  |  |  |
Series E Convertible Redeemable Preferred Shares | Issuance Date, June 3, 2019 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  | 27,500,098 |  |  |  |  |  |  |  |  |  |
Issue Price per Share | $ / shares |  | $ 0.7 |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance | $ |  | $ 20,115 |  |  |  |  |  |  |  |  |  |
Series E+ Convertible Redeemable Preferred Shares | Issuance Date, February 8, 2021 to May 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  |  |  | 1,953,652 |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  |  | $ 17.84 |  |  |  |  |  |
Proceeds from Issuance | ¥ |  |  |  |  |  |  |  | ¥ 241,341 |  |  |  |
Series E+ Convertible Redeemable Preferred Shares | Issuance Date, September 4 to September 14, 2020 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares | 4,203,072 |  |  |  |  |  |  |  |  |  |  |
Issue Price per Share | $ / shares | $ 17.84 |  |  |  |  |  |  |  |  |  |  |
Proceeds from Issuance | $ | $ 75,000 |  |  |  |  |  |  |  |  |  |  |
Series F Convertible Redeemable Preferred Shares |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  |  |  |  | 9,777,383 |  |  |
Series F Convertible Redeemable Preferred Shares | Issuance Date, April 16, 2021 to May 25, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Temporary Equity [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Issuance, Shares |  |  |  |  |  | 9,777,383 |  |  |  |  |  |
Issue Price per Share | $ / shares |  |  |  |  |  | $ 19.43 |  |  |  |  |  |
Proceeds from Issuance | $ |  |  |  |  |  | $ 168,000 |  |  |  |  |  |

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