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Share-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2018
Share-based Compensation [Abstract] |
Schedule Share-based Compensation Expense | The following table summarizes the components of share-based compensation expense for the three and six months ended June 30, 2018 and 2017 (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2018 |  | 2017 |  | 2018 |  | 2017
Research and development | $ | 341 |  |  | $ | 162 |  |  | $ | 381 |  |  | $ | 208 |
General and administrative | 1,627 |  |  | 1,262 |  |  | 1,734 |  |  | 1,611 |
Discontinued operations | — |  |  | 751 |  |  | — |  |  | 889 |
Total share-based compensation expense | $ | 1,968 |  |  | $ | 2,175 |  |  | $ | 2,115 |  |  | $ | 2,708 |
Schedule of Total Compensation Cost Related to Nonvested Awards | Total compensation cost related to nonvested awards not yet recognized and the weighted-average periods over which the awards are expected to be recognized at June 30, 2018 were as follows (in thousands):
| Stock Options |  | Restricted Stock
Unrecognized compensation cost | $ | 259 |  |  | $ | — |
Expected weighted-average period in years of compensation cost to be recognized | 2.19 |  |  | 0.00 |
Schedule of Fair Value of Share-based Compensation Awards | Total fair value of shares vested and the weighted average estimated fair values of shares granted for the six months ended June 30, 2018 and 2017 were as follows (in thousands):
| Stock Options
| Six Months Ended June 30,
| 2018 |  | 2017
Total fair value of shares vested | $ | 85 |  |  | $ | 5,002 |
Weighted average estimated fair value of shares granted | $ | 2.41 |  |  | $ | 1.72 |

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- Definition Tabular disclosure of components of a stock option or other award plan under which equity-based compensation is awarded to employees, typically comprised of the amount of unearned compensation (deferred compensation cost), compensation expense, and changes in the quantity and fair value of the shares (or other type of equity) granted, exercised, forfeited, and issued and outstanding pertaining to that plan. Disclosure may also include nature and general terms of such arrangements that existed during the period and potential effects of those arrangements on shareholders, effect of compensation cost arising from equity-based payment arrangements on the income statement, method of estimating the fair value of the goods or services received, or the fair value of the equity instruments granted, during the period, cash flow effects resulting from equity-based payment arrangements and, for registrants that accelerate vesting of out of the money share options, reasons for the decision to accelerate. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 + Details
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- Definition Tabular disclosure of the allocation of equity-based compensation costs to a given line item on the balance sheet and income statement for the period. This may include the reporting line for the costs and the amount capitalized and expensed. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901 Reference 3: http://www.xbrl.org/2003/role/presentationRef -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=27013229&loc=d3e301413-122809 + 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://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (f)(2) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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