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Research and Development Expenses (Tables) | 12 Months Ended
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Dec. 31, 2022
Research and Development Expenses |
Schedule of research and development expenses | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
​ |  | 2020 |  | 2021 |  | 2022
Employee compensation | ​ | 1,362,231 | ​ | 2,658,158 | ​ | 6,684,971
Design and development expenses | ​ | 778,463 | ​ | 1,572,834 | ​ | 3,276,915
Depreciation and amortization expenses | ​ | 255,544 | ​ | 214,312 | ​ | 333,097
Rental and related expenses | ​ | 51,123 | ​ | 53,846 | ​ | 193,132
Travel and entertainment expenses | ​ | 15,720 | ​ | 43,732 | ​ | 111,531
Others | ​ | 24,689 | ​ | 48,970 | ​ | 236,615
Total | ​ | 2,487,770 | ​ | 4,591,852 | ​ | 10,836,261

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