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Share-based compensation (Tables) | 12 Months Ended
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Dec. 31, 2021
Share-based compensation |
Schedule of weighted-average assumptions used in determining fair value of share based awards | The Company determines the fair value of share based awards at the grant date by using the Black-Scholes option-pricing model, and has utilized the “simplified” method, as prescribed by the SEC’s Staff Accounting Bulletin (“SAB”) No.110, Share-Based Payment, to compute expected lives of share based awards with the following weighted-average assumptions: ​
​ | ​ | ​ | ​ | ​ | ​
Years ended |  | ​ |  | ​ | ​
December 31, | ​ | 2021 | ​ | 2020 | ​
Assumptions |  |  |  |  |
Dividend yield |  | 0 | % | 0 | %
Risk free interest rate |  | 0.29%-0.85 | % | 0.27%-0.29 | %
Expected volatility |  | 90%-101 | % | 101%-103 | %
Expected lives |  | 2.5-5 years |  | 2.75-5 years |
Schedule of company's stock option plan | A summary of the activity for the Company’s Plans for the indicated periods is presented below: ​
​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted
​ | ​ | ​ | ​ | Average
Stock Options and Stock Appreciation Rights | ​ | Shares | ​ | Exercise Price
Outstanding at December 31, 2019 |  | 7,042,377 | ​ | $ | 1.01
-Cancelled |  | — | ​ | $ | —
-Exercised |  | (1,967,562) | ​ | $ | 0.91
-Granted |  | 254,700 | ​ | $ | 1.11
Outstanding at December 31, 2020 |  | 5,329,515 | ​ | $ | 1.06
-Cancelled |  | (133,257) | ​ | $ | 2.02
-Exercised |  | (3,076,489) | ​ | $ | 1.16
-Granted (1) |  | 484,254 | ​ | $ | 1.82
Outstanding at December 31, 2021 |  | 2,604,023 | ​ | $ | 1.03
​ (1) Options to purchase 463,754 shares were granted in 2021, all of which were vested immediately in 2021. In addition, 20,500 stock appreciation rights were granted in December 2021 with a six- month vesting period.
Schedule of weighted average contractual life and exercise price | The following is the weighted average contractual life in years and the weighted average exercise price at December 31, 2021 and 2020 of: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Remaining | ​ | Weighted
​ | ​ | Number of | ​ | Contractual | ​ | Average
December 31, 2021 | ​ | Options | ​ | Life | ​ | Exercise Price
Options outstanding and vested |  | 2,583,523 |  | 5.85 | ​ | $ | 1.00
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | ​ | ​
​ | ​ | ​ | ​ | Average | ​ | ​ | ​
​ | ​ | ​ | ​ | Remaining | ​ | Weighted
​ | ​ | Number of | ​ | Contractual | ​ | Average
December 31, 2020 | ​ | Options | ​ | Life | ​ | Exercise Price
Options outstanding |  | 5,329,515 |  | 3.55 | ​ | $ | 1.06
Options vested |  | 5,261,947 |  | 3.54 | ​ | $ | 1.05
Options unvested |  | 67,568 |  | 4.71 | ​ | $ | 1.23
Schedule of intrinsic value | The intrinsic values of options vested and exercised during the years ended December 31, 2021 and 2020 were as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | 2021 |  | 2020
Intrinsic value of options vested | ​ | $ | 1,481,858 | ​ | $ | 393,952
Intrinsic value of options exercised | ​ | $ | 7,088,578 | ​ | $ | 843,893

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- Definition Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Tabular disclosure of the total intrinsic value of options exercised (or share units converted), share-based liabilities paid, and the total fair value of shares vested during the year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + 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 -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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