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Stock-Based Compensation (Tables)
3 Months Ended
Mar. 31, 2016
Share-based Compensation [Abstract]  
Summary of Weighted-Average Assumptions of Stock Based Compensation

The following weighted-average assumptions were used for grants issued during the three months ended March 31, 2016 and 2015 under the ASC No. 718 requirements.

 

    Three months ended March 31,  
    2016     2015  
Weighted average risk-free rate     1.26 %     1.17 %
Weighted average volatility     110.71 %     81.38 %
Dividend yield     0.00 %     0.00 %
Expected life     6.02 years       4.45 years