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Stock-Based Compensation (Tables) | 6 Months Ended
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Jun. 30, 2019
Stock-Based Compensation |
Summary of assumptions used for awards |
Exercise price |  | $ | 0.69 |
Expected dividends |  |  | 0 | %
Expected volatility |  |  | 86 | %
Risk -free interest rate |  |  | 2.75 | %
Expected life of option |  |  | 4 | years
Summary of stock option activity | A summary of stock option activity for the six months ended June 30, 2019 and the year ended December 31, 2018 is as follows:
|  |  |  | Weighted |  | Weighted Average Remaining |  | Aggregate
|  |  |  | Average Exercise |  | Contractual Life |  | Intrinsic
|  | Options |  | Price |  | (in years) |  | Value
Balance - December 31, 2017 |  | 359,076 |  | $ | 53.93 |  | 4.60 |  | $ | 1,800
Granted |  | 671,500 |  | $ | 0.69 |  |  |  |  |
Expired |  | (78,667) |  | $ | 67.02 |  |  |  |  |
Forfeited |  | (12,927) |  | $ | 23.72 |  |  |  |  |
Balance - December 31, 2018 |  | 938,982 |  | $ | 15.18 |  | 6.19 |  | $ | —
Expired |  | (52,419) |  | $ | 68.96 |  |  |  |  |
Forfeited |  | (43,444) |  | $ | 8.30 |  |  |  |  |
Balance - June 30, 2019 - outstanding |  | 843,119 |  | $ | 12.19 |  | 5.85 |  | $ | —
Balance - June 30, 2019 - exercisable |  | 289,660 |  | $ | 32.81 |  | 4.80 |  | $ | —
Grant date fair value of options granted - June 30, 2019 |  |  |  | $ | — |  |  |  |  |
Weighted average grant date fair value - June 30, 2019 |  |  |  | $ | — |  |  |  |  |
Grant date fair value of options granted - December 31, 2018 |  |  |  | $ | 301,000 |  |  |  |  |
Weighted average grant date fair value - December 31, 2018 |  |  |  | $ | 0.45 |  |  |  |  |

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- Definition Tabular disclosure relates to share based compensation arrangement by share based payment award options and warrants vested and expected to vest outstanding and exercisable. + References No definition available. + 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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