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Share-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2019
Share-based Payment Arrangement [Abstract] |
Schedule of Share-based Compensation Expense | The following table summarizes the components of share-based compensation expense for the years ended December 31, 2019 and 2018 ($ in thousands):
| Year Ended December 31,
| 2019 |  | 2018
Research and development | $ | 274 |  |  | $ | 446 |
General and administrative | 1,021 |  |  | 2,007 |
Total share-based compensation expense | $ | 1,295 |  |  | $ | 2,453 |
Total compensation cost related to unvested awards not yet recognized and the weighted-average periods over which the awards are expected to be recognized at December 31, 2019 were as follows ($ in thousands):
| Stock Options |  | Restricted Stock Units |  | Restricted Stock
Unrecognized compensation cost | $ | 646 |  |  | $ | 49 |  |  | $ | 403 |
Expected weighted-average period in years of compensation cost to be recognized | 1.57 |  |  | 1.43 |  |  | 1.82 |
Schedule of Fair Value of Shares Vested and Weighted Average Estimated Fair Values of Shares Granted | Total fair value of shares vested and the weighted average estimated fair values of shares granted for the years ended December 31, 2019 and 2018 were as follows ($ in thousands):
|  | Stock Options
|  | Year Ended December 31,
|  | 2019 |  | 2018
Total fair value of shares vested |  | $ | 399 |  |  | $ | 218 |
Weighted average estimated fair value of shares granted |  | 3.18 |  |  | 2.61 |
Schedule of Assumptions in Calculating Fair Values of Stock Options | The range of assumptions made in calculating the fair values of stock options was as follow:
| Stock Options
| Year Ended December 31,
| 2019 |  | 2018
Expected term - minimum (in years) | 6 |  | 5.5
Expected term - maximum (in years) | 6 |  | 6
Expected volatility - minimum | 74% |  | 68%
Expected volatility - maximum | 74% |  | 73%
Weighted Average volatility | 74% |  | 72%
Expected dividend yield | — |  | —
Risk-free interest rate - minimum | 2.35% |  | 2.35%
Risk-free interest rate - maximum | 2.62% |  | 2.96%

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- Definition Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement. + 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 (h)(1) -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 S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5047-113901 + 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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