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Stock-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Stock Options Outstanding

The following table summarizes stock options outstanding and changes for the nine-month periods ending September 30, 2018 and 2017:

 

    September 30, 2018     September 30, 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     (80,412 )     5.24       (6,001 )     104.67  
Stock options outstanding at end of period     1,018,451     $ 1.91       293,991     $ 5.64  
Stock options exercisable at end of period     1,018,451     $ 1.91       104,722     $ 13.26  
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 September 30, 2018:

 

    Outstanding Stock Options     Exercisable Stock Options  
Stock Option Plan   Number of Outstanding Stock Options     Weighted Average Exercise Price    

Number of

Exercisable

Stock Options

     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 Stock Options-Alabama Graphite     289,600       1.61       289,600       1.61  
Replacement Stock Options-Anatolia Energy     85,233       8.87       85,233       8.87  
      1,018,451     $ 1.91       1,018,451     $ 1.91  
Summary of Status of Non-vested Restricted Shares

The following table summarizes RSU activity for the nine-month periods ended September 30, 2018 and 2017:

 

    September 30, 2018     September 30, 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     (9,429 )     1.40       -       -  
Vested     -       -       (39,340 )     4.16  
Unvested RSUs at end of period     169,468     $ 1.40       273,373     $ 1.95