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Stock-Based Compensation (Tables)
9 Months Ended
Sep. 30, 2016
Share-based Compensation [Abstract]  
Summary of Weighted-Average Assumptions of Stock Based Compensation

The following weighted-average assumptions were used for stock option grants issued during the three months ended September 30, 2015 and the nine months ended September 30, 2016 and 2015 under the ASC No. 718 requirements. There were no stock option grants during the three months ended September 30, 2016.

 

    Three months ended September 30,     Nine months ended September 30,  
    2016     2015     2016     2015  
Weighted average risk-free rate     --       1.27 %     1.20 %     1.18 %
Weighted average volatility     --       105.50 %     111.02 %     82.51 %
Dividend yield     --       0.00 %     0.00 %     0.00 %
Expected life     --       5.15 years       6.17 years       4. 3 years