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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Summary of Stock Option Activity | The following represents a summary of the options granted to employees and non-employees that are outstanding at December 31, 2019 and changes during the period then ended:
|  | Number of Shares |  |  | Weighted- Average Exercise Price |  |  | Aggregate Intrinsic Value |  |  | Weighted- Average Remaining Contractual Life (in years) |
Outstanding at December 31, 2018 |  |  | 673,885 |  |  | $ | 19.82 |  |  | $ | ― |  |  |  | 8.2 |
Options granted |  |  | 698,750 |  |  |  | 0.62 |  |  |  | ― |  |  |  | 8.6 |
Options forfeited |  |  | (207,991 | ) |  |  | 27.50 |  |  |  | ― |  |  |  | ― |
Outstanding at December 31, 2019 |  |  | 1,164,644 |  |  |  | 6.93 |  |  |  | ― |  |  |  | 8.4 |
Exercisable at December 31, 2019 |  |  | 481,883 |  |  | $ | 20.54 |  |  | $ | ― |  |  |  | 7.8 |
Schedule of Assumptions Used in Black-Scholes Option-Pricing Method | The material factors incorporated in the Black-Scholes model in estimating the fair value of the options granted for the periods presented were as follows (adjusted for 1-for-10 reverse stock split):
|  | For the year ended December 31, |
|  | 2019 |  |  | 2018 |
Expected dividend yield |  |  | 0.00 | % |  |  | 0.00 | %
Expected stock-price volatility |  |  | 46.33% - 69.38 | % |  |  | 46.47% - 53.11 | %
Risk-free interest rate |  |  | 1.47% - 2.60 | % |  |  | 2.46% - 3.07 | %
Term of options |  |  | 5 - 7 |  |  |  | 5 - 10 |
Stock price |  | $ | 0.60 - $1.04 |  |  | $ | 1.85 - $3.40 |

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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=116856206&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=116856206&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=116856206&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=116856206&loc=d3e5070-113901 + Details
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