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STOCK BASED COMPENSATION (Tables) | 6 Months Ended
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Jun. 30, 2020
STOCK BASED COMPENSATION |
Summary of Stock Options Outstanding |
|  | June 30, 2020 |  | June 30, 2019
|  |  |  | Weighted |  |  |  | Weighted
|  | Number of |  | Average |  | Number of |  | Average
|  | Stock |  | Exercise |  | Stock |  | Exercise
|  | Options |  | Price |  | Options |  | Price
Stock options outstanding at beginning of period |  | 37,786 |  | $ | 37.42 |  | 19,170 |  | $ | 79.78
Granted |  | 125,804 |  |  | 1.59 |  | — |  |  | —
Expired |  | (1,693) |  |  | 101.64 |  | (624) |  |  | 80.58
Canceled or forfeited |  | — |  |  | — |  | — |  |  | —
Stock options outstanding at end of period |  | 161,897 |  | $ | 8.91 |  | 18,546 |  | $ | 78.21
Stock options exercisable at end of period |  | 36,093 |  | $ | 34.41 |  | 18,546 |  | $ | 78.21
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 June 30, 2020:
|  | Outstanding Stock Options |  | Exercisable Stock Options
|  | Number of |  | Weighted |  | Number of |  | Weighted
|  | Outstanding |  | Average |  | Stock Options |  | Average
Stock Option Plan |  | Stock Options |  | Exercise Price |  | Exercisable |  | Exercise Price
2004 Plan |  | 92 |  | $ | 1,638.00 |  | 92 |  | $ | 1,638.00
2004 Directors’ Plan |  | 3 |  |  | 10,380.00 |  | 3 |  |  | 10,380.00
2013 Plan |  | 158,962 |  |  | 6.57 |  | 33,158 |  |  | 25.47
Replacement Options-Alabama Graphite |  | 2,840 |  |  | 75.94 |  | 2,840 |  |  | 75.94
|  | 161,897 |  | $ | 8.91 |  | 36,093 |  | $ | 34.41
Summary of RSU Activity |
|  | June 30, |  | June 30,
|  | 2020 |  | 2019
|  |  |  | 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
Granted |  | 211,497 |  |  | 2.03 |  | — |  |  | —
Forfeited |  | — |  |  | — |  | (565) |  |  | 70.00
Vested |  | — |  |  | — |  | — |  |  | —
Unvested RSUs at end of period |  | 211,497 |  | $ | 2.03 |  | 1,695 |  | $ | 70.00

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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=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 50 -Paragraph 2 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=116856206&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=116856206&loc=d3e5070-113901 + Details
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