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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2021
Stock-Based Compensation |
Summary of stock option activity | 4. Stock-Based Compensation – (continued) A summary of stock option activity for the six months ended June 30, 2021 and the year ended December 31, 2020 is as follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ |  | Weighted |  | Weighted Average |  | Aggregate
​ | ​ | ​ | ​ | Average Exercise | ​ | Remaining | ​ | Intrinsic
​ | ​ | Options | ​ | Price | ​ | Contractual Life | ​ | Value
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance - December 31, 2019 |  | 2,502,012 | ​ | $ | 3.62 |  | 6.51 years | ​ | $ | 153,353
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Granted |  | 1,540,000 | ​ | ​ | 0.42 |  | ​ | ​ |  | ​
Exercised | ​ | - | ​ | ​ | - | ​ | ​ | ​ | ​ | ​
Expired |  | (14,944) | ​ | ​ | 17.57 |  | ​ | ​ |  | ​
Forfeited |  | (29,650) | ​ | ​ | 0.55 |  | ​ | ​ |  | ​
Balance - December 31, 2020 |  | 3,997,418 | ​ | ​ | 2.35 |  | 6.09 years | ​ | ​ | -
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Granted |  | - | ​ | ​ | - |  | ​ | ​ |  | ​
Exercised |  | - | ​ | ​ | - | ​ | ​ | ​ | ​ | ​
Expired |  | - | ​ | ​ | - |  | ​ | ​ |  | ​
Forfeited |  | - | ​ | ​ | - |  | ​ | ​ |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance - June 30, 2021 - outstanding |  | 3,997,418 | ​ | $ | 2.35 |  | 5.28 years | ​ | $ | 598,074
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Balance - June 30, 2021 - exercisable |  | 1,970,911 | ​ | $ | 4.33 |  | 4.55 years | ​ | $ | 239,357
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Grant date fair value of options granted – three months ended June 30, 2021 | ​ | ​ | ​ | $ | - |  |  | ​ |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average grant date fair value – three months ended June 30, 2021 | ​ | ​ | ​ | $ | - |  |  | ​ |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Grant date fair value of options granted – year ended December 31, 2020 | ​ | ​ | ​ | $ | 412,000 |  |  | ​ |  |
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Weighted average grant date fair value – year ended December 31, 2020 | ​ | ​ | ​ | $ | 0.27 |  |  | ​ |  |
​

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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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