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Convertible Bonds - Additional Information (Details) - Convertible Bonds - 2016 Notes - Shanghai Wanwuxinsheng Environmental Protection Technology Group Co., Ltd. (Previously Shanghai Yueyee Network Information Technology Co., Ltd) (“Shanghai Yueyee” or “Shanghai Wanwuxinsheng”) |  | 12 Months Ended |
--- | --- | --- | ---
Nov. 28, 2016 CNY (¥) | Dec. 31, 2021 CNY (¥) | Dec. 31, 2018 CNY (¥) shares | Nov. 28, 2016 $ / shares
Debt Instrument [Line Items] |  |  |  |
Aggregate principal amount | ¥ 200,000,000 |  |  |
Maturity date | Jun. 30, 2018 |  |  |
Debt conversion, amount of debt converted |  |  | ¥ 40,000,000 |
Beneficial conversion feature | ¥ 0 |  |  |
Series C-3 Convertible Redeemable Preferred Shares |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Conversion price | $ / shares |  |  |  | $ 2.6532
Debt conversion, shares issued on conversion | shares |  |  | 2,255,380 |
Series C Convertible Redeemable Preferred Shares |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt conversion, amount of debt converted |  | ¥ 160,000,000 |  |

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