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Shareholders' Equity (Tables) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2020 | Dec. 31, 2019
Shareholders' Equity |  |
Schedule of Weighted Average Assumptions | The following weighted-average assumptions were used for stock option awards granted during the three and nine months ended September 30, 2019:
|  | Three months ended |  |  | Nine months ended |
|  | September 30, 2019 |  |  | September 30, 2019 |
Weighted average risk-free rate |  |  | 1.39 | % |  |  | 1.70 | %
Weighted average volatility |  |  | 95.11 | % |  |  | 108.83 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Expected term |  |  | 5.61 years |  |  |  | 5.73 years |
| The following weighted-average assumptions were used for grants issued during 2019 and 2018 under the ASC No. 718 requirements:
|  | 2019 |  |  | 2018 |
Weighted average risk-free rate |  |  | 1.68 | % |  |  | 2.87 | %
Weighted average volatility |  |  | 105.53 | % |  |  | 113.20 | %
Dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Expected term |  |  | 5.37 years |  |  |  | 7.06 years |
Schedule of Restricted Stock and Common Stock Unit Vested | The following table shows the number of RSUs that vested and were settled during the three and nine months ended September 30, 2020 and 2019, as well as the number of shares of common stock issued upon settlement. In lieu of paying cash to satisfy withholding taxes due upon the settlement of vested RSUs, an employee may elect to have shares of common stock withheld that would otherwise be issued at settlement, the value of which is equal to the amount of withholding taxes payable.
|  | Three months ended September 30, |  |  | Nine months ended September 30, |
|  | 2020 |  |  | 2019 |  |  | 2020 |  |  | 2019 |
Restricted stock units vested and settled |  |  | 19,000 |  |  |  | 18,000 |  |  |  | 39,000 |  |  |  | 29,000 |
Common stock issued, net of shares withheld |  |  | 14,000 |  |  |  | 13,000 |  |  |  | 28,000 |  |  |  | 20,000 |
Summary of Stock Option Activity |  | Stock Option Activity The following table summarizes stock option activities for the years ended December 31, 2019 and 2018:
|  | Outstanding Options |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Life (in years) |  |  | Aggregate Intrinsic Value |
Outstanding January 1, 2018 |  |  | 156,000 |  |  | $ | 17.74 |  |  | $ | 7.12 |  |  | $ | - |
Granted |  |  | 2,000 |  |  |  | 4.44 |  |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Cancelled |  |  | (6,000 | ) |  |  | 10.42 |  |  |  | - |  |  |  | - |
Forfeited |  |  | (4,000 | ) |  |  | 6.38 |  |  |  | - |  |  |  | - |
Expired |  |  | (1,000 | ) |  |  | 16.00 |  |  |  | - |  |  |  | - |
Outstanding December 31, 2018 |  |  | 147,000 |  |  |  | 18.20 |  |  |  | 6.08 |  |  |  | - |
Granted |  |  | 3,000 |  |  |  | 3.15 |  |  |  | - |  |  |  | - |
Exercised |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Cancelled |  |  | (6,000 | ) |  |  | 13.32 |  |  |  | - |  |  |  | - |
Forfeited |  |  | (2,000 | ) |  |  | 6.24 |  |  |  | - |  |  |  | - |
Expired |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Outstanding December 31, 2019 |  |  | 142,000 |  |  | $ | 18.26 |  |  |  | 5.14 |  |  | $ | - |
Options vested and exercisable at December 31, 2019 |  |  | 140,000 |  |  | $ | 18.43 |  |  |  | 5.10 |  |  | $ | - |
Summary of Restricted Stock Unit Activity |  | The following table summarizes restricted stock unit activity for the years ended December 31, 2019 and 2018:
|  | Outstanding Restricted Stock Units |  |  | Weighted Average Fair Value per Share |
January 1, 2018 |  |  | - |  |  | $ | - |
Granted |  |  | 74,000 |  |  |  | 5.13 |
Released |  |  | (13,000 | ) |  |  | 6.04 |
Canceled |  |  | - |  |  |  | - |
December 31, 2018 |  |  | 61,000 |  |  | $ | 4.94 |
Granted |  |  | 77,000 |  |  |  | 3.35 |
Released |  |  | (38,000 | ) |  |  | 4.09 |
Cancelled |  |  | (43,000 | ) |  |  | 4.17 |
December 31, 2019 |  |  | 57,000 |  |  | $ | 3.57 |
Balance expected to vest at December 31, 2019 |  |  | 19,000 |  |  |  |  |
Summary of Warrant Activities |  | Warrant Activity The following summarizes warrant activities for the years ended December 31, 2019 and 2018:
|  |  | Outstanding Warrants |  |  | Weighted Average Exercise Price per Share |  |  | Weighted Average Remaining Contractual Life (in years) |
Outstanding January 1, 2018 |  |  |  | 72,000 |  |  | $ | 20.00 |  |  |  | 0.87 |
Granted |  |  |  | - |  |  |  | - |  |  |  | - |
Exercised |  |  |  | - |  |  |  | - |  |  |  | - |
Forfeited |  |  |  | (72,000 | ) |  |  | - |  |  |  | - |
Outstanding December 31, 2018 |  |  |  | - |  |  | $ | - |  |  |  | - |

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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 Disclosure of the number and weighted-average grant date fair value for restricted stock and restricted stock units that were outstanding at the beginning and end of the year, and the number of restricted stock and restricted stock units that were granted, vested, or forfeited during the year. + References No definition available. + 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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