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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2023
Accounting Policies [Abstract] |
Schedule of property and equipment over estimated useful life | ​
Electronic equipment |  | 3 – 5 years
Machinery and equipment |  | 10 years
Furniture and fixture |  | 5 years
Transportation vehicles |  | 4 years
Leasehold improvements |  | Over the shorter of the expected lease term or useful lives
Schedule of intangible assets useful life | ​
Software |  | 3 – 10 years
Technology |  | 3 – 8 years
Schedule of accrued warranty liability | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year ended December 31,
​ |  | 2021 |  | 2022 |  | 2023
​ | ​ | RMB | ​ | RMB | ​ | RMB
Balance as of the beginning of the year |  | 10,042 |  | 13,932 |  | 17,694
Warranty provision |  | 10,766 |  | 8,467 |  | 26,247
Consumption |  | (6,876) |  | (4,705) |  | (15,516)
Balance as of the end of the year |  | 13,932 |  | 17,694 |  | 28,425
Schedule of impact on the combined and consolidated balance sheets upon adoption of ASC842 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, 2021 | ​ | January 1, 2022
​ | ​ | ​ | ​ | Effect of the | ​ | After adoption
​ |  | As reported |  | adoption of ASC 842 |  | of ASC 842
​ | ​ | RMB | ​ | RMB | ​ | RMB
ASSETS | ​ | ​ | ​ | ​ | ​ | ​
Right-of-use assets |  | — |  | 36,030 |  | 36,030
TOTAL ASSETS |  | — |  | 36,030 |  | 36,030
LIABILITIES AND SHAREHOLDERS’ EQUITY |  |  |  |  |  | ​
Accrued expenses and other current liabilities |  | 569 |  | 12,566 |  | 13,135
Lease liabilities, non-current |  | — |  | 23,464 |  | 23,464
TOTAL LIABILITIES |  | 569 |  | 36,030 |  | 36,599
TOTAL LIABILITIES AND SHAREHOLDERS’ DEFICIT |  | 569 |  | 36,030 |  | 36,599
Schedule of concentration of risks | Concentration of customers The following customers accounted for 10% or more of revenue for the years ended December 31, 2021, 2022 and 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year ended |
​ | ​ | December 31, |
​ |  | 2021 |  | 2022 |  | 2023 |
Customer A |  | * | ​ | 24.3 | % | 25.6 | %
Customer B | ​ | 17.5 | % | 13.7 | % | 28.4 | %
Customer C |  | 12.7 | % | * | ​ | * | ​
​ The following customers accounted for 10% or more of the Group’s accounts receivable, contract assets and amount due from related parties as of December 31, 2022 and 2023: ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31, | ​
​ |  | 2022 |  | 2023 |
Customer A |  | 61.0 | % | 41.3 | %
Customer B |  | 15.3 | % | 10.2 | %
Customer D |  | * | ​ | 11.2 | %
Concentration of suppliers The Group has one supplier accounted for 10% or more of purchases for the years ended December 31, 2021 and 2022: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the Year ended December 31, |
​ |  | 2021 |  | 2022 |  | 2023 |
Supplier A | ​ | 13.7 | % | 12.3 | % | * | ​

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