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Stock-based compensation (Tables) | 6 Months Ended
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Jun. 30, 2024
Share-Based Payment Arrangement [Abstract] |
Schedule of restricted share units | The following is a summary of the restricted share granted: ​
​ | ​ | ​
Restricted shares grants | ​ | Shares
Non-vested as of January 1, 2023 | ​ | 296,474
Granted | ​ | 113,984
Vested | ​ | (66,111)
Canceled | ​ | (87,611)
Non-vested as of December 31, 2023 | ​ | 256,736
Granted | ​ | 426,687
Vested | ​ | (69,938)
Canceled | ​ | —
Non-vested as of June 30, 2024 | ​ | 613,485
​ ​ The following is a summary of the status of restricted shares as of June 30, 2024: ​
​ | ​ | ​ | ​ | ​ | ​
​ | Outstanding Restricted Share
​ | ​ | ​ | ​ | ​ | Average Remaining
​ | Fair Value per share | ​ | Number | ​ | Amortization Period (Years)
$ | 3.90 | ​ | 61,250 | ​ | 0.58
$ | 2.52 | ​ | 2,430 | ​ | 0.75
$ | 2.20 | ​ | 16,363 | ​ | 0.50
$ | 2.08 | ​ | 96,635 | ​ | 1.75
$ | 2.08 | ​ | 10,120 | ​ | 1.75
$ | 1.50 | ​ | 413,354 | ​ | 2.75
$ | 1.50 | ​ | 13,333 | ​ | 0.50
​ | ​ | ​ | 613,485 | ​ | ​
Schedule of share option activities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | ​ |  | Weighted |  | Weighted |  | ​
​ | ​ | ​ | ​ | Weighted | ​ | Average | ​ | Average | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | Grant date | ​ | Remaining | ​ | Average
​ | ​ | Number of | ​ | Exercise | ​ | Fair | ​ | Contractual | ​ | Intrinsic
​ | ​ | Options | ​ | Price | ​ | Value | ​ | Term | ​ | value
​ | ​ | ​ | ​ | USD | ​ | USD | ​ | Years | ​ | USD
Share options outstanding at December 31, 2023 |  | 380,745 | ​ | 2.54 | ​ | 1.19 |  | 9.35 |  | —
Granted |  | 697,629 |  | 1.46 |  | 0.82 |  | 10.00 |  | —
Forfeited | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Exercised | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Expired | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Share options outstanding at June 30, 2024 |  | 1,078,374 | ​ | 1.84 | ​ | 0.95 |  | 9.06 | ​ | —
Vested and exercisable at June 30, 2024 |  | 272,597 |  | 2.55 |  | 1.20 |  | 7.79 |  | —
Schedule of assumptions used to value options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | April 2024 | ​ | March 2024 |  | March 2023 |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Risk-free interest rate |  | ​ | 4.54 | % | ​ | 4.21 | % | ​ | 3.65 | %
Expected volatility range |  | ​ | 55.32 | % | ​ | 55.11 | % | ​ | 63.36 | %
Fair market value per ordinary share as at grant dates | ​ | $ | 1.32 | ​ | $ | 1.50 | ​ | $ | 2.08 | ​
Schedule of share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Six Months Ended
​ | June 30,
​ |  | 2024 | ​ |  | 2023
​ | ​ | USD | ​ | ​ | USD
Selling and distribution expenses | $ | 73,916 | ​ | $ | 62,497
General and administrative expenses |  | 254,174 | ​ |  | 210,059
Total share-based compensation expenses | $ | 328,090 | ​ | $ | 272,556

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