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Summary of significant accounting policies - Additional Information (Details) |  | 6 Months Ended |  |
--- | --- | --- | --- | ---
Dec. 17, 2021 USD ($) item | Dec. 17, 2021 CNY (¥) item | Jun. 30, 2022 USD ($) shares | Jun. 30, 2022 CNY (¥) shares | Jun. 30, 2021 shares | Jun. 30, 2022 CNY (¥) shares | Dec. 31, 2021 USD ($) shares
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Restricted cash | $ |  |  | $ 0 |  |  |  | $ 422,832
Depreciation | $ |  |  | 0 |  |  |  |
Proceeds from third party loan | $ 6,663,200 | ¥ 44,629,608 |  |  |  |  |
Number of third parties | item | 2 | 2 |  |  |  |  |
Interest rate per annum | 6.00% | 6.00% |  |  |  |  |
Repayments of debt |  |  | 3,083,307 | ¥ 20,651,758 |  |  |
Outstanding debt |  |  | $ 3,579,893 |  |  | ¥ 23,977,850 | $ 7,002,385
Term of debt |  |  | 1 year | 1 year | 12 months |  |
Warranty period |  |  |  |  | 12 months |  |
Value added tax description |  |  | The Company is subject to VAT for selling merchandise. The applicable VAT rate is 11% or 13% or 17% (depending on the type of goods involved) for products sold in the PRC. The applicable VAT rate of 17% and 11% decreased to 16% and 10% starting from May 2018, and further decreased to 13% and 9% from April 1, 2019. | The Company is subject to VAT for selling merchandise. The applicable VAT rate is 11% or 13% or 17% (depending on the type of goods involved) for products sold in the PRC. The applicable VAT rate of 17% and 11% decreased to 16% and 10% starting from May 2018, and further decreased to 13% and 9% from April 1, 2019. |  |  |
Warrant [Member] |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Warrants outstanding |  |  | 6,558,175 |  |  | 6,558,175 |
Number of warrants included in diluted income per share |  |  | 16,225 | 16,225 |  |  |
Number of warrants not included in the diluted loss per share as they would be anti-dilutive |  |  |  |  | 0 |  |
Warrant [Member] | Split-adjusted |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Warrants outstanding |  |  |  |  |  |  | 27,322
Shangchi Automobile |  |  |  |  |  |  |
Summary Of Significant Accounting Policies |  |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Noncontrolling Owners |  |  | 30.00% |  |  | 30.00% |

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