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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Stockholders' Equity [Abstract] |
Information About Outstanding Warrants | The following table summarizes information about outstanding warrants at December 31, 2020:
| Number of ‎warrants |  | Weighted ‎average ‎exercise price
Outstanding at December 31, 2019 | 1,662,304 |  | $ | 3.25
Exercised | (713,449) |  |  | 3.25
Outstanding at December 31, 2020 | 948,855 |  | $ | 3.25
Exercisable at December 31, 2020 | 948,855 |  | $ | 3.25
Restricted Stock Activity | The Company’s restricted stock activity under the 2006 Plan and the 2016 Plan is summarized as follows:
| Shares |  | Weighted ‎average grant ‎date fair value
Unvested at December 31, 2019 | 39,900 |  | $ | 2.31
Granted | 100,319 |  |  | 1.88
Vested | (67,566) |  |  | 2.12
Unvested at December 31, 2020 | 72,653 |  | $ | 1.90
Stock Option Activity | The Company’s option activity under the 2006 Plan and the 2016 Plan is summarized as follows:
| Number of ‎options |  | Weighted ‎average ‎exercise price
Outstanding at December 31, 2019 | 573,925 |  | $ | 4.94
Issued | 104,458 |  |  | 1.99
Expired | (20,969) |  |  | 11.04
Outstanding at December 31, 2020 | 657,414 |  | $ | 4.28
Exercisable at December 31, 2020 | 598,139 |  | $ | 4.51
Information About Options Outstanding and Exercisable | The following table summarizes information about options outstanding and exercisable at December 31, 2020:
Weighted |  |  | Weighted |  |  | Weighted average
average exercise | Number of |  | average remaining | Number of |  | price of outstanding
price of outstanding | options |  | estimated life | options |  | and exercisable
options | outstanding |  | (in years) | exercisable |  | options
$1.88 - $2.50 | 531,519 |  | 8.3 | 472,244 |  |
$3.30 - $6.90 | 33,805 |  | 1.3 | 33,805 |  |
$7.50 - $10.80 | 20,503 |  | 3.5 | 20,503 |  |
$14.20 - $23.40 | 71,587 |  | 5.3 | 71,587 |  |
| 657,414 |  |  | 598,139 |  | $4.51
Stock Option Grants Weighted Average Assumptions | The fair values of stock option grants to employees and members of the Board of Directors during 2020, 2019, and 2018 were measured on the date of grant using Black-Scholes, with the following weighted average assumptions:
|  | 2020 |  | 2019 |  | 2018
Expected volatility |  | 101% - 104% |  |  | 89% - 100% |  |  | 81%
Risk free interest rate |  | 0.31% - 1.67% |  |  | 1.55% - 2.85% |  |  | 2.60%
Expected dividend yield |  | 0.0% |  |  | 0.0% |  |  | 0.0%
Expected life (in years) |  | 5 |  |  | 5 |  |  | 5
Expense Related to Options Revalued | The following table summarizes the expense related to the options revalued in June 2019:
Grant date | Number of options |  | Previous |  | Accelerated |  | Incremental |  | Total
1/11/2011 | 16,667 |  | $ | 109,769 |  | $ | — |  | $ | 11,782 |  | $ | 121,551
1/20/2014 | 6,667 |  |  | 120,712 |  |  | — |  |  | 7,621 |  |  | 128,333
2/27/2018 | 60,606 |  |  | 99,738 |  |  | — |  |  | 12,313 |  |  | 112,051
4/21/2017 | 20,000 |  |  | 70,346 |  |  | 20,736 |  |  | 13,485 |  |  | 104,567
4/30/2019 | 50,000 |  |  | 13,453 |  |  | 67,047 |  |  | 1,274 |  |  | 81,774
| 153,940 |  | $ | 414,018 |  | $ | 87,783 |  | $ | 46,475 |  | $ | 548,276
Share-based Compensation Costs Recognized on Financial Statements | The following table summarizes share-based compensation costs recognized in the Company’s Consolidated Statements of Operations and Comprehensive Loss for the years ended December 31, 2020, 2019, and 2018:
|  | 2020 |  | 2019 |  | 2018
Research and development | $ | 497 |  | $ | 3,127 |  | $ | 3,238
Sales and marketing |  | — |  |  | 12,578 |  |  | —
General and administrative |  | 436,194 |  |  | 856,472 |  |  | 260,158
Total share-based compensation | $ | 436,691 |  | $ | 872,177 |  | $ | 263,396

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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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- Definition Tabular disclosure of warrants or rights issued. Warrants and rights outstanding are derivative securities that give the holder the right to purchase securities (usually equity) from the issuer at a specific price within a certain time frame. Warrants are often included in a new debt issue to entice investors by a higher return potential. The main difference between warrants and call options is that warrants are issued and guaranteed by the company, whereas options are exchange instruments and are not issued by the company. Also, the lifetime of a warrant is often measured in years, while the lifetime of a typical option is measured in months. Disclose the title of issue of securities called for by warrants and rights outstanding, the aggregate amount of securities called for by warrants and rights outstanding, the date from which the warrants or rights are exercisable, and the price at which the warrant or right is exercisable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 50 -Section S99 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6784392&loc=d3e188667-122775 + Details
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- Definition Tabular disclosure of number, weighted-average exercise price or conversion ratio, aggregate intrinsic value, and weighted-average remaining contractual term for outstanding and exercisable options that are fully vested and expected to vest. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur. + 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 + Details
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