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STOCK-BASED COMPENSATION (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
STOCK-BASED COMPENSATION |  |
Summary of Stock Options Outstanding | The following table summarizes stock options outstanding and changes for the three-month periods ending March 31, 2019 and 2018:
|  | March 31, 2019 |  | March 31, 2018
|  |  |  | Weighted |  |  |  | Weighted
|  | Number of |  | Average |  | Number of |  | Average
|  | Stock |  | Exercise |  | Stock |  | Exercise
|  | Options |  | Price |  | Options |  | Price
Stock options outstanding at beginning of period |  | 19,170 |  | $ | 79.78 |  | 5,723 |  | $ | 276.50
Granted |  | — |  |  | — |  | — |  |  | —
Expired |  | (280) |  |  | 179.68 |  | (112) |  |  | 624.00
Stock options outstanding at end of period |  | 18,890 |  | $ | 78.21 |  | 5,611 |  | $ | 269.50
Stock options exercisable at end of period |  | 18,890 |  | $ | 78.21 |  | 1,828 |  | $ | 682.50
| The following table summarizes stock options outstanding and changes during the years ended December 31, 2018 and 2017:
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
|  | Number of Stock Options |  |  | Weighted Average Exercise Price |  |  | Number of Stock Options |  |  | Weighted Average Exercise Price |
Stock options outstanding at beginning of period |  |  | 286,174 |  |  | $ | 5.53 |  |  |  | 110,828 |  |  | $ | 18.24 |
Granted |  |  | 812,689 |  |  |  | 0.98 |  |  |  | 189,164 |  |  |  | 1.40 |
Expired |  |  | (140,374 | ) |  |  | 5.97 |  |  |  | (13,818 | ) |  |  | 50.88 |
Canceled or forfeited |  |  | - |  |  |  | - |  |  |  | - |  |  |  | - |
Stock options outstanding at end of period |  |  | 958,489 |  |  | $ | 1.60 |  |  |  | 286,174 |  |  | $ | 5.53 |
Stock options exercisable at end of period |  |  | 958,489 |  |  | $ | 1.60 |  |  |  | 97,010 |  |  | $ | 13.59 |
Summary of Stock Options Outstanding and Exercisable by Stock Option Plan | The following table summarizes stock options outstanding and exercisable by stock option plan at March 31, 2019:
|  | Outstanding Stock Options |  | Exercisable Stock Options
|  | Number of |  | Weighted |  | Number of |  | Weighted
|  | Outstanding |  | Average |  | Exercisable |  | Average
Stock Option Plan |  | Stock Options |  | Exercise Price |  | Stock Options |  | Exercise Price
2004 Plan |  | 96 |  | $ | 1,752.25 |  | 96 |  | $ | 1,752.25
2004 Directors’ Plan |  | 11 |  |  | 9,332.73 |  | 11 |  |  | 9,332.73
2013 Plan |  | 12,766 |  |  | 35.41 |  | 12,766 |  |  | 35.41
Replacement Stock Options-Alabama Graphite |  | 5,568 |  |  | 80.96 |  | 5,568 |  |  | 80.96
Replacement Stock Options-Anatolia Energy |  | 449 |  |  | 676.22 |  | 449 |  |  | 676.22
|  | 18,890 |  | $ | 78.21 |  | 18,890 |  | $ | 78.21
| The following table summarizes stock options outstanding and exercisable by stock option plan at December 31, 2018:
|  | Outstanding Stock Options |  |  | Exercisable Stock Options |
Stock Option Plan |  | Number of Stock Options Outstanding |  |  | Weighted Average Exercise Price |  |  | Number of Stock Options Exercisable |  |  | Weighted Average Exercise Price |
2004 Plan |  |  | 4,792 |  |  | $ | 35.14 |  |  |  | 4,792 |  |  | $ | 35.14 |
2004 Directors' Plan |  |  | 556 |  |  |  | 186.00 |  |  |  | 556 |  |  |  | 186.00 |
2013 Plan |  |  | 638,270 |  |  |  | 0.71 |  |  |  | 638,270 |  |  |  | 0.71 |
Replacement Options - AGC |  |  | 289,600 |  |  |  | 1.61 |  |  |  | 289,600 |  |  |  | 1.61 |
Replacement Options-AEK |  |  | 25,271 |  |  |  | 13.41 |  |  |  | 25,271 |  |  |  | 13.41 |
|  |  | 958,489 |  |  | $ | 1.60 |  |  |  | 958,489 |  |  | $ | 1.60 |
Summary of Status of Non-vested Restricted Shares | The following table summarizes RSU activity for the three-month periods ended March 31, 2019 and 2018:
|  | March 31, |  | March 31,
|  | 2019 |  | 2018
|  |  |  | Weighted- |  |  |  | Weighted-
|  |  |  | Average |  |  |  | Average
|  | Number of |  | Grant Date |  | Number of |  | Grant Date
|  | RSUs |  | Fair Value |  | RSUs |  | Fair Value
Unvested RSUs at beginning of period |  | 2,260 |  | $ | 70.00 |  | 3,578 |  | $ | 70.00
Granted |  | — |  |  | — |  | — |  |  | —
Forfeited |  | (565) |  |  | 70.00 |  | (189) |  |  | 70.00
Vested |  | — |  |  | — |  | — |  |  | —
Unvested RSUs at end of period |  | 1,695 |  | $ | 70.00 |  | 3,389 |  | $ | 70.00
| The following table summarizes RSU activity for the years ending December 31, 2018 and 2017:
|  | December 31, |  |  | December 31, |
|  | 2018 |  |  | 2017 |
|  | Number of RSUs |  |  | Weighted-Average Grant Date Fair Value |  |  | Number of RSUs |  |  | Weighted-Average Grant Date Fair Value |
Unvested RSUs at beginning of period |  |  | 178,897 |  |  | $ | 1.40 |  |  |  | 8,649 |  |  | $ | 43.71 |
Granted |  |  | - |  |  |  | - |  |  |  | 304,064 |  |  |  | 1.40 |
Forfeited |  |  | (37,674 | ) |  |  | 1.40 |  |  |  | (34,845 | ) |  |  | 5.72 |
Vested |  |  | (28,245 | ) |  |  | 1.40 |  |  |  | (98,971 | ) |  |  | 2.50 |
Unvested RSUs at end of period |  |  | 112,978 |  |  | $ | 1.40 |  |  |  | 178,897 |  |  | $ | 1.40 |

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