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Stock-Based Compensation (Tables) | 3 Months Ended
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Mar. 31, 2020
Share-based Payment Arrangement [Abstract] |
Schedule of Estimated Values of Stock Option Grants Valuation Assumptions | The weighted average estimated values of director and employee stock option grants, as well as the weighted average assumptions that were used in calculating such values during the three months ended March 31, 2020 and 2019, were based on estimates at the date of grant as follows:
|  | April 30, |  |  | January 1, |  |  | February 10, |
|  | 2015 Grant |  |  | 2016 Grant |  |  | 2016 Grant |
Risk-free interest rate |  |  | 1.43 | % |  |  | 1.76 | % |  |  | 1.15 | %
Weighted average expected term |  |  | 5 years |  |  |  | 5 years |  |  |  | 5 years |
Expected volatility |  |  | 143.10 | % |  |  | 134.18 | % |  |  | 132.97 | %
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | % |  |  | 0.00 | %
|  | December 6, |  |  | September 25, |
|  | 2016 Grant |  |  | 2017 Grant |
Risk-free interest rate |  |  | 1.84 | % |  |  | 1.85 | %
Weighted average expected term |  |  | 5 years |  |  |  | 5 years |
Expected volatility |  |  | 123.82 | % |  |  | 130.79 | %
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
|  | January 30, |  |  | March 11, |
|  | 2019 Grant |  |  | 2019 Grant |
Risk-free interest rate |  |  | 2.54 | % |  |  | 2.44 | %
Weighted average expected term |  |  | 5 years |  |  |  | 5 years |
Expected volatility |  |  | 115.80 | % |  |  | 116.46 | %
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Schedule of Stock Option Activity | A summary of stock option activity during the three months ended March 31, 2020 and 2019 is as follows:
|  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  | Weighted- |  |  | Average |  |  |  |
|  | Shares |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  | Under |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Option |  |  | Price |  |  | Life |  |  | Value |
Outstanding at January 1, 2020 |  |  | 46,860 |  |  | $ | 9.02 |  |  |  | 9 years |  |  |  | 19,200 |
Outstanding at March 31, 2020 |  |  | 46,860 |  |  | $ | 9.02 |  |  |  | 9 years |  |  | $ | 19,200 |
Exercisable at March 31, 2020 |  |  | 38,785 |  |  | $ | 9.54 |  |  |  | 9 years |  |  | $ | 19,200 |
|  |  |  |  |  |  |  | Weighted- |  |  |  |
|  |  |  |  | Weighted- |  |  | Average |  |  |  |
|  | Shares |  |  | Average |  |  | Remaining |  |  | Aggregate |
|  | Under |  |  | Exercise |  |  | Contractual |  |  | Intrinsic |
|  | Option |  |  | Price |  |  | Life |  |  | Value |
Outstanding at January 1, 2019 |  |  | 36,760 |  |  | $ | 25.04 |  |  |  | 8 years |  |  |  | 79,200 |
Granted |  |  | 43,550 |  |  |  | 6.72 |  |  |  |  |  |  |  |  |
Forfeited and expired |  |  | (33,450 | ) |  |  | 43.00 |  |  |  |  |  |  |  |  |
Outstanding at March 31, 2019 |  |  | 46,860 |  |  | $ | 9.02 |  |  |  | 9 years |  |  | $ | 19,200 |
Exercisable at March 31, 2019 |  |  | 28,710 |  |  | $ | 10.61 |  |  |  | 9 years |  |  | $ | 19,200 |

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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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