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Stock-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2023
Share-Based Payment Arrangement [Abstract] |
Schedule of restricted share units | ​
​ | ​ | ​
Restricted shares grants | ​ | Shares
Non-vested as of January 1, 2022 | ​ | —
Granted | ​ | 296,474
Vested | ​ | —
Canceled | ​ | —
Non-vested as of December 31, 2022 | ​ | 296,474
Granted | ​ | 113,984
Vested | ​ | (66,111)
Canceled | ​ | (87,611)
Non-vested as of December 31, 2023 | ​ | 256,736
​
​ | ​ | ​ | ​ | ​ | ​
​ | Outstanding Restricted Share
​ | ​ | ​ | ​ | ​ | Average Remaining
​ | Fair Value per share | ​ | Number | ​ | Amortization Period (Years)
$ | 3.90 | ​ | 122,500 | ​ | 1.08
$ | 2.52 | ​ | 3,889 | ​ | 1.25
$ | 2.20 | ​ | 16,363 | ​ | 1.00
$ | 2.08 | ​ | 96,635 | ​ | 2.25
$ | 2.08 | ​ | 17,349 | ​ | 2.25
​ | ​ | ​ | 256,736 | ​ | ​
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, 2022 |  | 380,745 | ​ | 2.54 | ​ | 1.19 |  | 9.35 |  | —
Granted |  | 158,976 |  | 2.08 |  | 1.26 |  | 9.75 |  | —
Forfeited | ​ | 183,722 | ​ | — | ​ | — | ​ | — | ​ | —
Exercised | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Expired | ​ | — | ​ | — | ​ | — | ​ | — | ​ | —
Share options outstanding at December 31, 2023 |  | 355,999 | ​ | 3.48 | ​ | 1.77 |  | 8.29 | ​ | —
Vested and exercisable at December 31, 2023 |  | 196,079 |  | 2.57 |  | 1.21 |  | 8.29 |  | —
Schedule of assumptions used to value options granted | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | For the | ​ | For the |
​ | ​ | Year Ended | ​ | Year Ended | ​
​ | ​ | December 31, | ​ | December 31, |
​ | ​ | 2023 | ​ | 2022 |
​ | ​ | ​ | ​ | ​ | ​
Risk-free interest rate |  | ​ | 3.65 | % | ​ | 2.49 - 2.92 | %
Expected volatility range |  | ​ | 63.36 | % | ​ | 40.30 - 45.67 | %
Fair market value per ordinary share as at grant dates | ​ | $ | 2.08 | ​ | $ | 2.26 - 3.07 | ​
Schedule of share-based compensation expense | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended
​ | December 31,
​ |  | 2023 | ​ |  | 2022
​ | ​ | USD | ​ | ​ | USD
Selling and distribution expenses | $ | 124,994 | ​ | $ | 108,694
General and administrative expenses |  | 292,984 | ​ |  | 274,878
Total share-based compensation expenses | $ | 417,978 | ​ | $ | 383,572

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- Definition Tabular disclosure for stock option plans. Includes, but is not limited to, outstanding awards at beginning and end of year, grants, exercises, forfeitures, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (e) -SubTopic 10 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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- Definition Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 718 -SubTopic 10 -Subparagraph (f)(2) -Name Accounting Standards Codification -Paragraph 2 -Section 50 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480429/718-10-50-2 + Details
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