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Stock-Based Compensation (Tables) | 12 Months Ended
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Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |
Schedule of Allocated Stock-based Compensation Expense | The following table summarizes the components of stock-based compensation expense in the consolidated statements of operations for the years ended December 31, 2018 and 2017, respectively (in thousands):
| Years Ended December 31,
| 2018 |  | 2017
Research and development | $ | 77 |  |  | $ | 729 |
General and administrative | 318 |  |  | 2,440 |
Total stock-based compensation | $ | 395 |  |  | $ | 3,169 |
Assumptions for Option Grants Issued | The Company uses the Black-Scholes option-pricing model and the following assumptions were used to determine the weighted average fair value of all its stock options granted during the year ended December 31, 2018:
Risk free interest rate | 2.73 | %
Volatility | 80.83 | %
Expected lives (years) | 6.20 |
Expected dividend yield | — | %
Stock Option Activity | The following table summarizes stock option activity of the Company for the year ended December 31, 2018:
| Total Number of Shares (In Thousands) |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (in years) |  | Aggregate Intrinsic Value (In Thousands)
Outstanding at January 1, 2018 | 10 |  |  | $ | 1,240.55 |  |  | 1.00 |  | $ | — |
Granted | 483 |  |  | 5.24 |  |  |  |  | — |
Canceled | (98 | ) |  | 5.30 |  |  |  |  | $ | — |
Outstanding at December 31, 2018 | 395 |  |  | $ | 37.09 |  |  | 9.01 |  | $ | — |
Options exercisable at December 31, 2018 | 53 |  |  | $ | 241.17 |  |  | 7.63 |  | $ | — |

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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://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=109197908&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=109197908&loc=d3e5047-113901 + Details
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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=109197908&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=109197908&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=109197908&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=109197908&loc=d3e5070-113901 + Details
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